CODENAME: UMBRA

CODENAME: UMBRA

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Head of project: Dr. Isaac Calloway
Authorised by O5-9

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UMBRA-1 Log

Resources used:
High frequency sound emitter
Handheld delivery weapon, designation Alpha-Gamma-23
Dummy target

SCP subjects:
SCP-939-34
SCP-939-35
SCP-939-36
SCP-939-37

Other subjects:
D-08281
MTF unit B-04416 (Sgt. Tremaine Davis)

Initial test log:

UMBRA-1

Goal of tests: To see if certain soundwaves can negate 939's ability to detect prey.

Note: The main method of 939's detection could be related to vibrations in the air caused by sound. If this is true, there may be a way to safely negate such waves and effectively render our operatives invisible to 939. -Dr Isaac Calloway

Test UMBRA-1.1
Subjects: SCP-939-34, SCP-939-35, SCP-939-36, SCP-939-37

00:00 SCP-939-34 introduced to chamber.

00:05 Sounds of varying frequencies played. Subject reacts to air vibrations with confusion.

00:10 Extremely high-frequency sound played. Subject reacts with discomfort and hostility.

00:15 Extremely low-frequency sound played. Subject reacts with confusion.

00:20 Frequency adjusted. Low frequency sound played. Subject does not react.

00:30 Low frequency sound played. Several loud noises played overtop. Subject does not react.

01:00 SCP-939-35 through 37 introduced to chamber. Subjects react as expected.

01:10 Low frequency sound played. Several loud noises played overtop. Subjects do not react.

Test results: Frequency found, subjects ready for test UMBRA-1.2.

Test UMBRA-1.2
Subjects: SCP-939-34, SCP-939-35, D-08281

00:00 SCP-939-34 introduced to chamber.

00:10 Low frequency sound played. Subject does not react.

00:20 Class-D personnel introduced to chamber. D-08281 reacts with distress, creating noise. Subject does not react.

00:35 Extremely high frequency sound played overtop of low frequency sound. Subject reacts with hostility towards source of sound, but seems to be unable to detect D-08281.

00:50 D-08281 removed from chamber.

01:20 SCP-939-35 introduced to chamber, with high frequency sound emitter attached. Subject reacts with hostility, and test is halted before any physical harm can come to either subject.

Test results: Success. Proof of concept established. Subjects ready for test UMBRA-1.3

Test UMBRA-1.3
Subjects: SCP-939-34, dummy target, MTF unit B-04416

00:00 Dummy target set up in end of chamber.

00:10 SCP-939-34 introduced to chamber.

00:15 Low frequency played. MTF B-04416 enters chamber, outfitted with delivery device Alpha-Gamma-23. Subject does not react.

00:25 MTF B-04416 fires delivery device at dummy target. Subject reacts with hostility towards dummy target, ignoring MTF B-04416

Test results: Success. Construction of portable frequency-emitting devices authorised.

SCP-939-34 through 37 outfitted with remote portable frequency-emitters, set to low frequency. Handlers designated as MTF Umbra-1, outfitted with long and short range handheld delivery weapons, with high-frequency ammunition. MTF Umbra-1 also outfitted with emergency extreme high-frequency emitter, designed to cause discomfort and pain in SCP-939 subjects, and filtration devices implemented in masks to negate compound AMN-C227. SCP-939-34 to 37 outfitted with remote detonators as failsafes.

Note: Although the devices stop 939 from hearing certain frequencies, thus removing risk, MTF agents are recommended to mantain radio silence while Umbra-1-939 units are deployed. - Dr. Calloway

MTF UMBRA-1, Designation "Good Boys"

MTF Umbra-1 are to be deployed in scenarios that involve enemy personnel in an open environment. Umbra-1-939 units can be deployed to seek and destroy enemy forces, or as assassination tools.

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UMBRA-2 Log

Resources used:
Experimental headgear, designation: HG-044
Shock collars
Restraints
SCP-966 tissue samples

SCP subjects:
SCP-966-5
SCP-966-6
Both SCP subjects were recently recovered from ███████, Germany.

Other subjects:
D-01572
D-18482
Adult male pig (Subject U-2-1)

Initial test logs:

UMBRA-2

Goal of tests: To determine if SCP-966 can be deterred from attacking certain targets, and possibly be utilised in infiltrating enemy buildings.

Test UMBRA-2.1
Subjects: SCP-966-5, D-01572, Subject U-2-1

00:00 SCP-966-5 introduced to chamber.

00:10 D-01572 introduced to chamber. Subject U-2-1 introduced to chamber.

00:15 SCP-966-5 showed temporary confusion at both subjects, before approaching D-01572. Subject U-2-1 became distressed, while D-01572 was unaware of the danger.

00:50 D-01572 showing signs of early exposure to ██████ waves. SCP-966-5 halted before subject. Subject U-2-1 extremely distressed.

01:00 All subjects withdrawn from testing chamber.

Test Results: SCP-966-5 shown to prefer human prey over animal prey.

Test UMBRA-2.2
Subjects: D-18482, SCP-966-5

00:00 D-18482 enters chamber, outfitted with HG-044. SCP-966-5 enters chamber.

00:45 SCP-966-5 shows confusion, D-18482 shows no signs of exposure to ██████ waves.

00:50 SCP-966-5 attempts to physically assault D-18482. All subjects withdrawn to prevent damage.

Test Results: HG-044 successful in deflecting ██████ waves.

MTF Umbra-2 outfitted with HG-044 units, and given infrared eyepieces. SCP-966-5 and 6 outfitted with restraints and remote shock collars designed to induce paralysis. Through research on SCP-966-1 through 4, and tissue samples from SCP-966-5 and 6, the collars were covered in a material that mimics the properties of SCP-966 tissue.

MTF Umbra-2, Designation "Sleep Demons"

MTF Umbra-2 is to be deployed in situations where enemy forces are entrenched in a fortress or other defensive position. Umbra-2-966 units can be dispatched into enemy buildings, as a solution to prolonged sieges or standoffs.