Per 
SCP-XXXX upon initial discovery. See Addendum XXXX-2.
Item #: SCP-XXXX
Object Class: Keter Euclid
Special Containment Procedures: SCP-XXXX is currently contained in Site-19. SCP-XXXX is to be kept in a sealed and password-locked stainless steel chamber. The inside and outside of the steel chamber should be lined with drywall. The drywall should be no less than 1.5 cm thick. Every surface of the inside and outside of the chamber should be completely covered with 5 cm thick acoustic foam. The acoustic foam should be covered with randomly spaced 50 x 50 x 5 cm panels of identical acoustic foam, each panel placed no more than 1 meter from another.
The chamber should have two electronically opened and timed steel doors, both lined with acoustic foam on both sides. The two doors should be separated by a 5 m long sealed tunnel made of identical steel, drywall, and acoustic foam. When the correct password is applied, the outer door will open. There should be a 10-second delay between the outer door closing and the inner door opening. The inner chamber should be equipped with a military-grade air raid siren.
SCP-XXXX's containment chamber is to be accessed only by specially trained Mobile Task Force Eta-11 ("Savage Beasts"). The chamber is to be inspected biweekly for any changes or damages to the inside or outside of the containment chamber.
There is to be a sound meter on the inside of the containment chamber. The sound meter is to be connected to a display on the outside of the chamber which is to show the current sound level of the inner chamber. The sound level in the containment chamber must not exceed 10 dB. Should the sound level approach 10 dB, MTF Eta-11 is to be alerted immediately.
Description: SCP-XXXX is a creature similar in appearance to a human, save for the fact that it appears to completely lack a head and any body hair. It stands 2.8 m tall and weighs 193 kg. SCP-XXXX is generally passive and spends most of its time sitting or pacing around its containment chamber. When it is not aggravated, it seems to appreciate the presence of humans, often standing up to "look" at them and move around them. However, SCP-XXXX becomes extremely hostile when exposed to sound levels above 10 dB. When aggravated, it is shown to reach speeds of up to 40 km per hour and is apparently able to tear its way through every material that has been tested thus far (see Experiment Log XXXX-A). In this state, it appears to be far more sensitive to sound than in its docile state. It is unknown how SCP-XXXX senses sound, as it appears to completely lack all sensory organs except for skin.
When agitated, SCP-XXXX's skin becomes hot and turns red-brown, similar in appearance to hot metal. Its skin has been shown to reach temperatures of up to 120°C. It will first destroy the original source of its agitation, and will then destroy anything or anyone else nearby emitting sound. Its typical methods of doing so are punching or running/charging at high speeds into its target. It appears to be unharmed by puncture wounds, burns, and blunt force, including (but not limited to) high-caliber rounds, solid concrete, solid steel, and its own containment chamber (see Experiment Log XXXX-A). It will remain in its state of rage until it is recontained or collapses from exhaustion. Once it recovers from its aggravated state, its skin will cool down rapidly until it reaches its normal temperature.
Addendum XXXX-1: In the event of a containment breach, the air raid siren in SCP-XXXX's containment chamber is to be turned on. Once inside, both doors are to be closed and locked and the siren turned off. Any damage is to be repaired by MTF Eta-11.
Addendum XXXX-2 (Discovery): Emergency service operators in Dublin, Ireland received a call from a panicked elderly woman, whose identity remains unknown to the SCP Foundation. She claimed that she had found a car on the side of the road with its hood and roof completely caved in. She eventually discovered a dead body in close proximity. A phone was discovered inside the car with a single picture of SCP-XXXX saved on it (see above). It is believed the picture was taken just seconds before the victim was killed by SCP-XXXX. Upon further inspection, the victim had suffered third-degree burns and blunt force trauma to the skull and ribs. The police later alerted the SCP Foundation and SCP-XXXX was placed in temporary containment shortly after. After multiple containment breaches, it was discovered that SCP-XXXX is only hostile when exposed to sound. MTF Eta-11 was dispatched and SCP-XXXX was placed in permanent containment.
Experiment Log XXXX-A
Experiment Log XXXX-1
Subject: 0.5 m thick barrier of solid concrete, 1 bell controlled by mechanical arm.
Test: SCP-XXXX placed behind barrier by MTF Eta-11. Bell placed on opposite side of barrier. Bell rung. SCP-XXXX becomes enraged and charges through barrier with little to no effort and destroys mechanical arm. Bell melts. SCP-XXXX recontained.
Comments: That thing tore through solid concrete like a hot knife through butter. And it melted the bell. This is going to be a pain in the ass. - Dr. H
Experiment Log XXXX-2
Subject: 0.5 m thick solid stainless steel barrier lined with drywall and acoustic foam (identical to the walls inside SCP-XXXX's containment chamber), 1 bell controlled by mechanical arm.
Test: SCP-XXXX placed behind barrier by MTF Eta-11. Bell placed on opposite side of barrier. Bell rung. SCP-XXXX becomes enraged. After ~1.3 seconds of pushing, SCP-XXXX charges through barrier, destroying mechanical arm. Bell melts. SCP-XXXX recontained.
Comments: Well shit. Maybe we should try something else. - Dr. H
Experiment Log XXXX-3
Subject: 5 meters of solid concrete, 1 bell controlled by mechanical arm.
Test: SCP-XXXX placed behind barrier by MTF Eta-11. Bell placed on opposite side of barrier. Bell rung. SCP-XXXX becomes enraged. SCP-XXXX breaks through entire barrier in ~4 seconds. Concrete reduced to rubble. SCP-XXXX destroys mechanical arm. Bell melts. SCP-XXXX escapes testing, running into three researchers in the process. MTF Eta-11 opens fire on SCP-XXXX. SCP-XXXX remains unharmed. Two researchers suffered third-degree burns and are currently recovering. One researcher [REDACTED]. SCP-XXXX recontained.
Comments: At least it's not smart enough to run around the barrier. But seriously? Five meters of concrete? It ran through like it was air. It would have taken four seconds for it to run five meters whether the concrete was there or not. What [DATA EXPUNGED] - Dr. H
Experiment Log XXXX-4
Subject: SCP-XXXX's containment chamber, 1 D-Class Personnel equipped with 1 air horn.
Test: SCP-XXXX placed in containment chamber. D-Class placed immediately outside containment chamber. D-Class activates air horn. SCP-XXXX breaches containment. D-Class [REDACTED] in the process. SCP-XXXX forcefully recontained.
Comments: That was stupid. Whose idea was this? XXXX's containment chamber works fine as it is. Just don't [EXPLETIVES EXPUNGED], you morons. I'm going to request demotion to Euclid class. No more testing for now. -Dr. H
Testing with SCP-XXXX has since been discontinued.
