EngiN33R

Revision 1

Item #: SCP-4038

Object Class: Safe

Special Containment Procedures: SCP-4038 is to be kept in its original wooden box inside a standard lead-lined storage container at Site-77.

Description: SCP-4038 is a set of six metallic wristbands, numbered SCP-4038-1 to -6; all six objects are practically identical, with insignificant variations in mass. SCP-4038 was discovered in possession of an antiques dealer in ██████████, Wales, on ██/██/20██, after rumors of a mind reading device began circulating in the town. A cover story was disseminated, describing the rumors as a hoax, and exposed persons were administered amnestics. The original container for the objects was a wooden box with slots for eight wristbands; two were missing at the time of initial containment. The owner claimed the objects came into his possession already an incomplete set. The wooden container bears no markings and exhibits no anomalous properties. Foundation intelligence is still attempting to ascertain the whereabouts of the missing items, numbered SCP-4038-7 and SCP-4038-8.

SCP-4038 objects measure approximately 100 mm in diameter, 15 mm in width and 3 mm in thickness. The wristbands are made from a duralumin-like alloy, notably containing tungsten in non-negligible proportions. Despite not containing any radioactive materials, the objects emit weak but constant x-ray radiation. The objects' interior makeup is homogeneous, containing no extraneous materials, bodies or cavities.

Scan of the surface of SCP-4038-6; first quarter displayed (positions 0-156). Detailed scans are available in Addendum 4038/006.

Each object has an identical pattern of small depressions (approximately 0.5 mm in diameter and depth) around its circumference. The depressions are spaced unevenly. No meaning to their configuration has been discerned as of yet, and no definite theory has been formulated on whether these features are ornamental or functional. Current attempts at deciphering the pattern involve studying potential information carried by the intervals between depressions.¹

When at rest, SCP-4038's diameter is large enough to allow most humans to put their hand through it. Once around a human wrist, SCP-4038 usually (see below) enters its active state, which is marked with an approximately 27% increase in x-ray output. SCP-4038 also reconfigures itself to fit snugly around the wrist. This process involves the object changing its dimensions — primarily diameter and thickness, although some variation in width has also been observed. Throughout this process, the object's mass stays constant, though the object's density undergoes slight variation. The size of the depressions on SCP-4038's surface also changes to preserve their configuration relative to each other. The processes involved in SCP-4038's ability to recognise acceptable human candidates and change its shape are not yet understood.

As long as only one subject is wearing SCP-4038 in a 30 meter radius, they experience no anomalous effects. When attempting to remove it, SCP-4038 reconfigures itself to normal size and returns to its idle state; however, SCP-4038 may only be removed in this way as long as the wearer is conscious and not inwardly opposed to the object's removal. Forcible removal of SCP-4038 remains possible through amputation or other trauma.

Primary anomalous effects are exhibited when more than one subject is wearing SCP-4038 in a 30 m radius — these subjects are referred to as "connected". After several minutes, connected subjects appear to gain rudimentary telepathic abilities — this phenomenon is referred to as "connection". Initially, this connection is maintained only while staying within 30 m of each other; however, as more time is spent by the subjects around each other, the effective range becomes longer, and the connection between the subjects becomes more profound.

After spending approximately two hours in a connection, subjects are able to meaningfully communicate without vocalisation; by that point subjects also gain basic familiarity with skills, knowledge and mental conditions of other connected subjects. The degree of connection between subjects grows exponentially with time, though a higher number of connected subjects leads to slower growth. Most effects of SCP-4038 exposure disappear fully within 24 hours of connection termination.

The following definite properties of these anomalous effects have been ascertained in the course of experimentation with the object:

• SCP-4038 only enters its active state when exposed to humans older than 12 years with average hand and forearm proportions.
• Abilities acquired from exposure to SCP-4038 do not extend to unconnected persons in any capacity.
• Once an initial connection is formed, new participants may only enter the connection if they are within initial effective range (30 m) of the existing participants.
  • Groups of subjects separated by distances greater than 30 m form separate connections amongst themselves, without interlinking.
  • Bringing two separate connected groups within 30 m does not lead to an interlink.
• Connections propagate by proxy; as long as each member of a connection is connected to at least one other member, total connection is maintained.
  • Exiting effective range severs the connection until such a time when the effective range extends far enough.
• Time spent outside of the connection does not contribute to alterations in mental state; when outside of effective range, SCP-4038 is considered not to exhibit its primary anomalous properties in practice.

Based on the single prolonged exposure experiment currently on file (see Addendum 4038/012), prolonged connection has been observed to create an extremely powerful mental link between subjects. Prolonged connection also creates extreme aversion to the idea of being parted from SCP-4038 in the subjects. However, it is currently unclear whether this is an anomalous property of the object itself, or an effect of the relationship established between connected subjects. Short-term exposure (defined as up to two hours) does not carry this risk.

An experiment log is enclosed in Addendum 4038/011. Proposed potential military, medical, scientific and other applications of SCP-4038 are enclosed in Addendum 4038/022.

[+] Addendum 4038/011: Aggregated Experiment Log

Addendum 4038/011: Aggregated Experiment Log

For the following experiments, unless otherwise noted, two subjects were connected with SCP-4038. Only one of them (the "subject") was interviewed; the other subject (the "counterpart"), where applicable, was not informed of the nature of the test. To minimise side effects from the two-way connection, the subject is selected from a pool of D-class personnel without a history of violent crime. One experiment was conducted per day and experiment duration was limited to two hours. An abridged list of experiments follows; a full and unedited log is available in Addendum 4038/013.

Test #	Subject	Counterpart	Outcome
4038/E-005	D-9183	D-8145	See Addendum 4038/012
4038/E-007	D-7145	A retail display mannequin	Active state not triggered.
4038/E-008	D-7145	A young male dog, Dachshund breed (SCP-4038 applied as collar)	Active state not triggered.
4038/E-009	D-7145	Female child (8 months)	Active state not triggered.
4038/E-009	D-7145	Adult male with both hands amputated	Active state not triggered.
4038/E-011	D-7145	A recently deceased (2 hrs) adult female	After 13 minutes, subject stated he was feeling "depressed" and "hollow". Subject reported perceiving a total absence of thought within the counterpart; exact wording was "…not like when you're thinking about nothing, 'cause you still think about some stuff, this is just… nothing at all". Feelings exacerbated as experiment went on. Experiment terminated prematurely after 21 minutes of total exposure due to subject showing significant distress. Subject's emotional state returned to normal the following day.
4038/E-012	D-7145	A deceased (43 hrs) adult male	Active state not triggered.2
4038/E-015	D-7145	Adult male suffering from severe intellectual disability	After 30 minutes, subject reported difficulty forming thoughts and expressing ideas. Immediately after termination of experiment, subject was administered an intelligence quotient test. Subject's IQ was measured at 87 compared to pre-testing levels of 103. IQ returned to pre-testing levels after four hours.
4038/E-016	D-7145	Adult male with synesthesia	After 45 minutes, subject reported seeing colours when viewing letters and words. Colours were consistent with the counterpart's synesthesia. Effects persisted for two hours after SCP-4038 had been taken off.
4038/E-018	D-7145	Adult female suffering from acute schizophrenia	After 16 minutes, subject reported hearing hostile auditory hallucinations. Description of the voice matches the counterpart's. Hallucinations increased in frequency and hostility with time, becoming more personal towards the subject. Experiment terminated prematurely after 29 minutes of total exposure due to subject showing significant distress. Hallucinations fully disappeared within forty minutes after experiment termination.
4038/E-027	D-7145	Adult Chinese male without knowledge of English	Subject was successfully able to read counterpart's surface thoughts, although subject reported that some of them were "unclear". After 32 minutes, subject began experiencing some difficulty expressing himself verbally, routinely remembering Mandarin words in place of English.3 Subject showed no distress, instead describing the effects as "cool". By the 68-minute mark, confusion had lessened and subject was able to express himself in Mandarin at a low intermediate level. Mandarin proficiency decreased over a ten-hour period after termination of experiment; however, subject is still able to recall simple words and greetings in the language.4
4038/E-031	D-5471	Young female suffering from anxiety	After 27 minutes, subject began exhibiting symptoms consistent with mild anxiety. Subject showed no significant distress. At the same time, counterpart reported feeling better; EEG scans confirmed a decrease in anxiety-related brain activity. Both participants returned to respective baselines within three hours of experiment termination.
4038/E-034	D-5471	Adult male blind from birth	After 19 minutes, subject reported greater auditory, tactile and olfactory sensitivity. After 71 minutes subject was able to read Braille. At the same time, counterpart expressed a great deal of confusion and reported experiencing strange sensations. Experiment terminated prematurely after 73 minutes of total exposure.
4038/E-059	MTF Theta-90 ("Angle Grinders")		MTF Theta-90 agents ████ and ██████ were issued SCP-4038 objects, fully aware of their effects. After 30 minutes, connected agents engaged in training exercises against other Theta-90 operatives. Several exercises were performed; each successive exercise showed improved reaction times, tactical awareness and coordination in connected agents. SCP-4038 was safely removed and returned to containment after 103 minutes of total exposure. No lasting effects have been observed in agents affected by the object.5

Experiments involving cross-testing with humanoid objects in Foundation custody is pending O5 approval.

---

[+] Addendum 4038/012: Experiment Log 4038/E-005

Addendum 4038/012: Experiment Log 4038/E-005

This experiment was conducted in parallel to scheduled daily testing. Two subjects, D-9183 (male, 32 years) and D-8145 (female, 34 years) were connected with SCP-4038 and moved to a joint quarters under supervision. Subjects were not informed of the nature of the object or the purpose of the experiment. Subjects were instructed to present a written and spoken report of their status every 24 hours; subjects were instructed to write and dictate a report before the experiment began — this was used as baseline. An abridged log of this experiment is provided below; a full and unedited log is available in Addendum 4038/015.

Time	Log entry
T+00:00:31	D-9183 initiates conversation with D-8145 about the nature of the experiment and the subjects' background.
T+00:03:08	D-8145 asks if D-9183 said something. D-9183 did not speak.
T+00:05:59	D-9183 asks if D-8145 said something. D-8145 did not speak.
T+00:08:31	D-8145 asks if D-9183 said something. D-9183 did not speak. Subjects express animosity towards each other, each believing the other to be playing tricks on them.
T+00:09:03	D-9183 asks D-8145 not to hit him. When D-8145 asked why he said this, he stated to have "had a feeling".
T+00:10:09	Subjects attempt to ascertain the nature of the objects. After D-8145 confesses to having thought about striking D-9183, subjects agree that the objects enable them to read each other's minds.
T+00:17:37	Subjects begin experimentation, attempting to read each other's thoughts. Subjects establish rapport.
T+00:31:42	D-9183 addresses the researchers, thanking them for giving him "something good for a change".
T+02:01:22	Amount of verbal conversation has decreased. Subjects noted to occasionally interrupt leisure activities to look at each other without saying anything.
T+04:22:57	Subjects engage in sexual intercourse. No coherent vocalisations are heard.6
T+22:09:13	Subjects exhibit impaired gross and fine motor skills, stumbling and having trouble operating kitchen and writing utensils.
T+24:00:00	Subjects are asked to present their reports. No significant deviation is noted in written reports; subjects show some difficulty expressing themselves when presenting spoken reports. Contents of these and further reports are available in Addendum 4038/018.
T+38:15:49	Subjects' gross and fine motor skills appear to return to baseline. However, subjects now exhibit greater synchronicity in movement and utensil operation.
T+48:00:00	Subjects are asked to present their reports. Written reports are broadly similar in contents; independent linguistic analysis indicates they were written by the same person, although handwriting analysis attributes authorship of the reports to each of the subjects. Spoken reports use turns of phrase commonly used by both subjects.
T+51:14:11	Subjects' eating and sleeping habits appear to have become totally synchronised. Other biological processes, however, are not synchronised, likely due to differences in metabolism. Subjects also exhibit independence during leisure activities; D-8145 frequently paints with provided supplies, whereas D-9183 uses a provided notebook to write. However, subjects occasionally switch places (approx. 25% of the time), despite having no background in each other's hobbies. Writing and paintings produced when subjects are switched are consistent with normal production.
T+53:26:27	At this point, subjects' only coherent vocalisations are aimed at the researchers, and constitute requests for supplies or food. The subjects speak markedly faster than normal and appear to be less concerned with grammar and syntax.
T+72:00:00	Subjects are asked to present their reports. Subjects provide totally identical written reports and recite the same spoken report, verbatim, in unison. Although the subjects' usual communications with researchers are rarely grammatical, presented reports are well formulated and articulated. Linguistic features are consistent with previous analysis.

No more changes in subjects' behavior took place after the 72-hour point.

After one week, the experiment was officially terminated. Subjects strongly resisted security personnel attempting to separate them and remove SCP-4038, displaying superior tactical awareness and coordination. Both expressed no desire to hurt Foundation personnel, but maintained that they would not permit the connection to be broken. SCP-4038 was finally removed after sedating the subjects and breaking several bones in their hands and wrists. Objects were returned to storage, and sedated subjects were returned to prior confinement.

Upon regaining consciousness, both subjects went into extreme emotional distress. State of distress continued for several days, after which subjects entered a severe depressive state. Within one week, subjects independently requested termination ahead of schedule (denied). Linguistic analysis of requests showed significant differences in style and phrasing, similar, but not identical, to pre-experimental levels. Within the same week, subjects' schedules and habits desynchronised. Within two weeks, verbal and motor skills fully returned to baseline.

34 days after the conclusion of the experiment, D-9183 committed suicide. Security personnel involved in this incident were subject to appropriate disciplinary action. Subject's decision to commit suicide was ruled to have been caused by a prolonged severe depressive state. Simultaneously with D-9183's expiration, D-8145 lost consciousness for 3 minutes 17 seconds. Once D-8145 regained consciousness, she went into a state of severe emotional distress that lasted for three hours.

Since this incident, D-8145's behavior returned to normal, with the exception of occasional spontaneous awakenings during the night (between 0100 and 0400) accompanied by [REDACTED]. It is currently unclear whether this is a side effect of D-8145's compromised mental state or [REDACTED]. No special confinement protocols outside of existing security are deemed necessary. The subject is to undergo mandatory psychological evaluation every two weeks.⁷

Further experiments involving prolonged exposure, as well as experiments involving D-8145, are discontinued pending Ethics Committee approval.

---

Revision 2

Item #: SCP-4038

Object Class: Safe

Special Containment Procedures: SCP-4038 is to be kept in its original wooden box inside a standard lead-lined storage container at Site-77.

Description: SCP-4038 is a set of seven metallic wristbands, numbered SCP-4038-1 to -7; all seven objects are practically identical, with insignificant variations in mass. SCP-4038 objects measure approximately 100 mm in diameter, 15 mm in width and 3 mm in thickness. The wristbands are made from a duralumin-like alloy, notably containing tungsten in non-negligible proportions. Despite not containing any radioactive materials, the objects emit weak but constant x-ray radiation; effective radiation dose from 24 hours of exposure is equal to approximately 0.0021 rem (approximately equivalent to two days of exposure to Earth's natural background radiation). The objects' interior makeup is homogeneous, containing no extraneous materials, bodies or cavities.

SCP-4038 was discovered after an investigation of a case of mass suicide by local law enforcement in ██████████, Wales. Investigation began after a postal worker called emergency services due to a foul smell emanating from the residence located at ██ ██████ St. Seven partially decomposed bodies, four male and three female, were discovered inside the building, each wearing an SCP-4038 object (in their idle states at the time); cause of death was determined to be exsanguination due to severed carotid arteries.

After examination of writings found on the scene, victims were found to have been part of a doomsday cult called Temple of the Seventh Heaven. Embedded Foundation assets were alerted to SCP-4038's existence after it was sent to Cardiff University for detailed study, at which time the object was taken into Foundation custody, involved persons were administered amnestics and official documents were appropriately amended. Transcripts of the discovered writings are enclosed in Addendum 4038/008.

During initial containment, a container was found at the scene of the suicide, believed to be the original storage for SCP-4038. The container is an ornate wooden box measuring 60 cm × 60 cm × 35 cm (L × W × H) with double doors on top. Interior is covered in felt and contains eight cavities perfectly accommodating SCP-4038; seven are located radially around an eighth, located in the center. All eight cavities are equal in dimensions. The container bears no markings and exhibits no anomalous properties. Extensive searches have been conducted, but an eighth SCP-4038 object (provisionally numbered SCP-4038-8) has not yet been located; it is unknown whether SCP-4038-8 is identical to the other seven SCP-4038 objects, but it is assumed that it bears superficial similarity.

Scan of the surface of SCP-4038-6; first quarter displayed (positions 0-156). Detailed scans are available in Addendum 4038/006.

Each SCP-4038 object has an identical pattern of small depressions (approximately 0.5 mm in diameter and depth) around its circumference. The depressions are spaced unevenly. No meaning to their configuration has been discerned as of yet, and no definite theory has been formulated on whether these features are ornamental or functional. Current attempts at deciphering the pattern involve studying potential information carried by the intervals between depressions.⁸

When at rest, SCP-4038's diameter is large enough to allow most humans to put their hand through it. Once around a human wrist, SCP-4038 usually (see below) enters its active state, which is marked with an approximately 27% increase in x-ray output. SCP-4038 also reconfigures itself to fit snugly around the wrist. This process involves the object changing its dimensions — primarily diameter and thickness, although some variation in width has also been observed. Throughout this process, the object's mass stays constant, though the object's density undergoes slight variation. The size of the depressions on SCP-4038's surface also changes to preserve their configuration relative to each other. In addition to changes in measurements, the object rapidly heats up to match the subject's body temperature. The processes involved in SCP-4038's ability to recognise acceptable human candidates and change its shape and temperature are not yet understood.

As long as only one subject is wearing SCP-4038 in a 30 meter radius, they experience no anomalous effects. When attempting to remove it, SCP-4038 reconfigures itself to normal size and returns to its idle state; however, SCP-4038 may only be removed in this way as long as the wearer is conscious and not inwardly opposed to the object's removal. Forcible removal of SCP-4038 remains possible through amputation or other trauma.

Primary anomalous effects are exhibited when more than one subject is wearing SCP-4038 in a 30 m radius — these subjects are referred to as "connected". After several minutes, connected subjects appear to gain rudimentary telepathic abilities — this phenomenon is referred to as "connection". Initially, this connection is maintained only while staying within 30 m of each other; however, as more time is spent by the subjects around each other, the effective range becomes longer, and the connection between the subjects becomes more profound.

After spending approximately two hours in a connection, subjects are able to meaningfully communicate without vocalisation; by that point subjects also gain basic familiarity with skills, knowledge and mental conditions of other connected subjects. The degree of connection between subjects grows exponentially with time, though a higher number of connected subjects leads to slower growth. Most effects of SCP-4038 exposure disappear fully within 24 hours of connection termination.

The following definite properties of these anomalous effects have been ascertained in the course of experimentation with the object:

• SCP-4038 only enters its active state when exposed to humans older than 12 years with average hand and forearm proportions.
• Once an initial connection is formed, new participants may only enter the connection if they are within initial effective range (30 m) of the existing participants.
  • Groups of subjects separated by distances greater than 30 m form separate connections amongst themselves, without interlinking.
  • Bringing two separate connected groups within 30 m does not lead to an interlink.
• Connections propagate by proxy; as long as each member of a connection is connected to at least one other member, total connection is maintained.
  • Exiting effective range severs the connection until such a time when the effective range extends far enough.
• Time spent outside of the connection does not contribute to alterations in mental state; when outside of effective range, SCP-4038 is considered not to exhibit its primary anomalous properties in practice.

Based on the single prolonged exposure experiment currently on file (see Addendum 4038/012), prolonged connection has been observed to create an extremely powerful mental link between subjects. Prolonged connection also creates extreme aversion to the idea of being parted from SCP-4038 in the subjects. However, it is currently unclear whether this is an anomalous property of the object itself, or an effect of the relationship established between connected subjects. Short-term exposure (defined as up to two hours) does not carry this risk.

An abridged experiment log is enclosed in Addendum 4038/011. Proposed potential military, medical, scientific and other applications of SCP-4038 are discussed in Addendum 4038/022.

[+] Addendum 4038/008: Temple of the Seventh Heaven Writings (Abridged)

Addendum 4038/008: Temple of the Seventh Heaven Writings (Abridged)

A diary was discovered alongside one of the deceased members, █████ ███████, at the place of initial containment. Transcripts of entries from the notebook are provided below. The date of the first entry, ██/██/20██, is henceforth referred to as Day 1, and each entry is dated relative to Day 1. In total, 43 entries have been omitted for brevity; an unabridged transcript of all entries is available in Addendum 4038/009.

Day 1

Today we have all been officially inducted into the Temple. I feel truly blessed. I shall be our Teacher's scribe and preserve His teachings for future acolytes.

His first lesson was spiritual resolve. Modern society and inventions cause many to become complacent, wanting and striving for nothing. Only those who constantly struggle towards self-betterment are blessed and pure. [REDACTED FOR BREVITY]

Day 25

Truly, a miracle has occurred today: our Teacher presented us with bracelets He calls soul-bands. He says they are a special and wondrous gift to Him from God, and it is true — our meeting today took place as we were wearing our soul-bands, and we all felt a most profound spiritual connection with each other. It was almost as though I could feel my brothers and sisters while we were reflecting. We all felt happy and joyous. Brother ██████ wept. We had to leave our soul-bands after the end of our meeting, and the loss we felt was great, but I look forward to our next meeting.

Today, His lesson was on the earthly and the heavenly. Many are misguided, thinking earthly desires sinful and resenting them. In truth, as the soul inhabits the flesh, the flesh affects the soul. Fulfilling earthly desires is simply another step towards purifying the soul, for when the flesh is healthy and content, the soul may endeavour to better itself with more ease. Though earthly desires may corrupt the soul when indulged in excess, those who are strong and resolute shall not fall into temptation, for the soul is not slave to the flesh. [REDACTED FOR BREVITY]

Day 29

With each meeting, our connection grows stronger. Our Teacher told us the soul-bands help us grow closer to each other, but that in time, we won't need them to be together in spirit. I wish for that day to come soon.

Today, His lesson was the virtues of love. Closeness of spirit begets closeness of body, and closeness of body reinforces closeness of spirit. [REDACTED FOR BREVITY] After today's reflection, with our Teacher's blessing we were together. Brother and Sister ███ wished for our Teacher to join us, but He said we would be together with Him in time, once we truly understood His lessons.

Day 37

Our Teacher spoke to us with his spirit today. It was a miracle, and we all wept at hearing his words in our minds and feeling them in our souls. We feel closer than ever before, and our Teacher says we may keep our soul-bands outside our meetings.

Today, His lesson was humility. [REDACTED FOR BREVITY]

Day 45

It's getting harder to write, because words do no justice to what we feel. Our Teacher says we're almost ready, and we know that we are.

Today, His lesson was patience.

Day 57

Teacher said we were ready today, and we were. He wanted to take us in, but he was afraid of what we had become. He struck down our flesh, but we didn't falter. We had taken his lessons to heart. We showed him the virtues of acceptance and welcomed him.

Today and forever, our lesson is unity.

The identity of the character of Teacher has not yet been ascertained. The current working theory is that this person or being is the eighth member of the group, currently in possession of the missing SCP-4038-8. Locating Teacher remains a high-priority task in the course of SCP-4038's study.

---

[+] Addendum 4038/011: Aggregated Experiment Log (Abridged)

Addendum 4038/011: Aggregated Experiment Log (Abridged)

For the following experiments, unless otherwise noted, two subjects were connected with SCP-4038. Only one of them (the "subject") was interviewed; the other subject (the "counterpart"), where applicable, was not informed of the nature of the test. To minimise side effects from the two-way connection, the subject is selected from a pool of D-class personnel without a history of violent crime. One experiment was conducted per day and experiment duration was limited to two hours. An abridged list of experiments follows; a full and unedited log is available in Addendum 4038/013.

Test #	Subject	Counterpart	Outcome
4038/E-005	D-9183	D-8145	See Addendum 4038/012
4038/E-007	D-7145	A retail display mannequin	Active state not triggered.
4038/E-009	D-7145	Female child (8 months)	Active state not triggered.
4038/E-009	D-7145	Adult male with both hands amputated	Active state not triggered.
4038/E-011	D-7145	A recently deceased (2 hrs) adult female	After 13 minutes, subject stated he was feeling "depressed" and "hollow". Subject reported perceiving a total absence of thought within the counterpart; exact wording was "…not like when you're thinking about nothing, 'cause you still think about some stuff, this is just… nothing at all". Feelings exacerbated as experiment went on. Experiment terminated prematurely after 21 minutes of total exposure due to subject showing significant distress. Subject's emotional state returned to normal the following day.
4038/E-012	D-7145	A deceased (43 hrs) adult male	Active state not triggered.9
4038/E-016	D-7145	Adult male with synesthesia	After 45 minutes, subject reported seeing colours when viewing letters and words. Colours were consistent with the counterpart's synesthesia. Effects persisted for two hours after SCP-4038 had been taken off.
4038/E-027	D-7145	Adult Chinese male without knowledge of English	Subject was successfully able to read counterpart's surface thoughts, although subject reported that some of them were "unclear". After 32 minutes, subject began experiencing some difficulty expressing himself verbally, routinely remembering Mandarin words in place of English.10 Subject showed no distress, instead describing the effects as "cool". By the 68-minute mark, confusion had lessened and subject was able to express himself in Mandarin at a low intermediate level. Mandarin proficiency decreased over a ten-hour period after termination of experiment; however, subject is still able to recall simple words and greetings in the language.11
4038/E-031	D-5471	Young female suffering from anxiety	After 27 minutes, subject began exhibiting symptoms consistent with mild anxiety. Subject showed no significant distress. At the same time, counterpart reported feeling better; EEG scans confirmed a decrease in anxiety-related brain activity. Both participants returned to respective baselines within three hours of experiment termination.
4038/E-059	MTF Theta-90 ("Angle Grinders")		MTF Theta-90 agents ████ and ██████ were issued SCP-4038 objects, fully aware of their effects. After 30 minutes, connected agents engaged in training exercises against other Theta-90 operatives. Several exercises were performed; each successive exercise showed improved reaction times, tactical awareness and coordination in connected agents. SCP-4038 was safely removed and returned to containment after 103 minutes of total exposure. No lasting effects have been observed in agents affected by the object.12

Experiments involving cross-testing with humanoid objects in Foundation custody is pending O5 approval.

---

[+] Addendum 4038/012: Experiment Log 4038/E-005 (Abridged)

Addendum 4038/012: Experiment Log 4038/E-005 (Abridged)

This experiment was conducted in parallel to scheduled daily testing. Two subjects, D-9183 (male, 32 years) and D-8145 (female, 34 years) were connected with SCP-4038 and moved to a joint quarters under supervision. Subjects were not informed of the nature of the object or the purpose of the experiment. Subjects were instructed to present a written and spoken report of their status every 24 hours; subjects were instructed to write and dictate a report before the experiment began — this was used as baseline. An abridged log of this experiment is provided below; a full and unedited log is available in Addendum 4038/015.

Time	Log entry
T+00:00:31	D-9183 initiates conversation with D-8145 about the nature of the experiment and the subjects' background.
T+00:03:08	D-8145 asks if D-9183 said something. D-9183 did not speak.
T+00:05:59	D-9183 asks if D-8145 said something. D-8145 did not speak.
T+00:08:31	D-8145 asks if D-9183 said something. D-9183 did not speak. Subjects express animosity towards each other, each believing the other to be playing tricks on them.
T+00:09:03	D-9183 asks D-8145 not to hit him. When D-8145 asked why he said this, he stated to have "had a feeling".
T+00:10:09	Subjects attempt to ascertain the nature of the objects. After D-8145 confesses to having thought about striking D-9183, subjects agree that the objects enable them to read each other's minds.
T+00:17:37	Subjects begin experimentation, attempting to read each other's thoughts. Subjects establish rapport.
T+00:31:42	D-9183 addresses the researchers, thanking them for giving him "something good for a change".
T+02:01:22	Amount of verbal conversation has decreased. Subjects noted to occasionally interrupt leisure activities to look at each other without saying anything.
T+04:22:57	Subjects engage in sexual intercourse. No coherent vocalisations are heard.13
T+22:09:13	Subjects exhibit impaired gross and fine motor skills, stumbling and having trouble operating kitchen and writing utensils.
T+24:00:00	Subjects are asked to present their reports. No significant deviation is noted in written reports; subjects show some difficulty expressing themselves when presenting spoken reports. Contents of these and further reports are available in Addendum 4038/018.
T+38:15:49	Subjects' gross and fine motor skills appear to return to baseline. However, subjects now exhibit greater synchronicity in movement and utensil operation.
T+48:00:00	Subjects are asked to present their reports. Written reports are broadly similar in contents; independent linguistic analysis indicates they were written by the same person, although handwriting analysis attributes authorship of the reports to each of the subjects. Spoken reports use turns of phrase commonly used by both subjects.
T+51:14:11	Subjects' eating and sleeping habits appear to have become totally synchronised. Other biological processes, however, are not synchronised, likely due to differences in metabolism. Subjects also exhibit independence during leisure activities; D-8145 frequently paints with provided supplies, whereas D-9183 uses a provided notebook to write. However, subjects occasionally switch places (approx. 25% of the time), despite having no background in each other's hobbies. Writing and paintings produced when subjects are switched are consistent with normal production.
T+53:26:27	At this point, subjects' only coherent vocalisations are aimed at the researchers, and constitute requests for supplies or food. The subjects speak markedly faster than normal and appear to be less concerned with grammar and syntax.
T+72:00:00	Subjects are asked to present their reports. Subjects provide totally identical written reports and recite the same spoken report, verbatim, in unison. Although the subjects' usual communications with researchers are rarely grammatical, presented reports are well formulated and articulated. Linguistic features are consistent with previous analysis.

No more changes in subjects' behavior took place after the 72-hour point.

After one week, the experiment was officially terminated. Subjects strongly resisted security personnel attempting to separate them and remove SCP-4038, displaying superior tactical awareness and coordination. Both expressed no desire to hurt Foundation personnel, but maintained that they would not permit the connection to be broken. SCP-4038 was finally removed after sedating the subjects and breaking several bones in their hands and wrists. Objects were returned to storage, and sedated subjects were returned to prior confinement.

Upon regaining consciousness, both subjects went into extreme emotional distress. State of distress continued for several days, after which subjects entered a severe depressive state. Within one week, subjects independently requested termination ahead of schedule (denied). Linguistic analysis of requests showed significant differences in style and phrasing, similar, but not identical, to pre-experimental levels. Within the same week, subjects' schedules and habits desynchronised. Within two weeks, verbal and motor skills fully returned to baseline.

34 days after the conclusion of the experiment, D-9183 committed suicide. Security personnel involved in this incident were subject to appropriate disciplinary action. Subject's decision to commit suicide was ruled to have been caused by a prolonged severe depressive state. Simultaneously with D-9183's expiration, D-8145 lost consciousness for 3 minutes 17 seconds. Once D-8145 regained consciousness, she went into a state of severe emotional distress that lasted for three hours.

Since this incident, D-8145's behavior returned to normal, with the exception of occasional spontaneous awakenings during the night (between 0100 and 0400) accompanied by [REDACTED]. It is currently unclear whether this is a side effect of D-8145's compromised mental state or [REDACTED]. No special confinement protocols outside of existing security are deemed necessary. The subject is to undergo mandatory psychological evaluation every two weeks.¹⁴

Further experiments involving prolonged exposure, as well as experiments involving D-8145, are discontinued pending Ethics Committee approval.

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Footnotes

1. When the entire circumference of the band is overlaid with a line of circles equal in diameter to the depressions, the band fits precisely 628 circles, and the sizes of the intervals between depressions can be expressed in terms of integer numbers of these circles. This pattern and integer sequence, as well as media the pattern has been embedded into for study by independent researchers, are described in detail in Addendum 4038/006.

2. The difference in behaviour between deceased subjects may be of profound importance. I am formally requesting a separate line of inquiry into this area. — Dr. ████████

3. Subject only speaks English and had no prior familiarity with any foreign languages.

4. Evidently, some irreversible changes occur despite our efforts. I believe further experiments should, at the very least, rotate D-class subjects to minimise these effects. — Researcher ██████████

5. This experiment was performed by MTF Theta-90 and Researcher ████ without proper authorisation and in violation of several security precautions associated with SCP-4038 testing. Parties involved were subject to disciplinary action. However, this experiment also served as basis for recommended applications of SCP-4038 within Foundation task forces (see Addendum 4038/022). MTF Theta-90 agents have since requested access to SCP-4038 for use in especially dangerous missions.

6. Subjects frequently performed sexual activities over the course of the experiment. Log entries pertaining to these activities have been omitted due to being largely inconsequential.

7. I strongly believe these occurrences are linked to the anomalous properties of the object and behavior I noted previously. Therefore I am also requesting reclassification of D-8145 to SCP-4038-A. — Dr. ████████

8. When the entire circumference of the band is overlaid with a line of circles equal in diameter to the depressions, the band fits precisely 628 circles, and the sizes of the intervals between depressions can be expressed in terms of integer numbers of these circles. This pattern and integer sequence, as well as media the pattern has been embedded into for study by independent researchers, are described in detail in Addendum 4038/006.

9. The difference in behaviour between deceased subjects may be of profound importance. I am formally requesting a separate line of inquiry into this area. — Dr. ████████

10. Subject only speaks English and had no prior familiarity with any foreign languages.

11. Evidently, some irreversible changes occur despite our efforts. I believe further experiments should, at the very least, rotate D-class subjects to minimise these effects. — Researcher ██████████

12. This experiment was performed by MTF Theta-90 and Researcher ████ without proper authorisation and in violation of several security precautions associated with SCP-4038 testing. Parties involved were subject to disciplinary action. However, this experiment also served as basis for recommended applications of SCP-4038 within Foundation task forces (see Addendum 4038/022). MTF Theta-90 agents have since requested access to SCP-4038 for use in especially dangerous missions.

13. Subjects frequently performed sexual activities over the course of the experiment. Log entries pertaining to these activities have been omitted due to being largely inconsequential.

14. I strongly believe these occurrences are linked to the anomalous properties of the object and behavior I noted previously. Therefore I am also requesting reclassification of D-8145 to SCP-4038-A. — Dr. ████████