Per 
SCP XXXX DATA BASE
SCP XXXX upon discovery
Item #: SCP XXXX
Object Class: Safe
Special Containment Procedures: SCP XXXX is to be kept in a room 4m x 15m x 7m made out of a non-trans lucid material such as thick concrete. The containment chamber has to be equipped with 4 microphones on each corner and just one light source that should only be operational from the outside.
Throughout experiment sessions, the room in which SCP XXXX is kept should be completely isolated from any source of light, to do this, the members of the facility staff will have to properly seal all entrances of the containment chamber. Opening any entrance or turning on the light is not allowed until all subjects are outside SCP XXXX-H.
There are special diving suits made to research the interior of SCP XXXX-H, these suits feature trackers and permeable microphones. Additionally, subjects must enter with white canes to assure they can walk out of the room after the process has ended.
Not authorized personnel should not know anything about the properties of SCP XXXX-H to avoid further complications during certain procedures such as the Hadal operation or the protocol-A001.
Description: SCP XXXX is rectangular swimming Pool made out of concrete that is 12 meters long, 5 meters wide and 2 meters deep. The Pool doesn’t present any anomaly under normal circumstances, but when the structure is put in a pitch black environment, the depth of it reaches unknown levels, in this state the structure becomes SCP XXXX-H.
If a light reflects on the bottomless pit, the Pool comes back to its normal state. Additionally, all objects below 2 meters in the water disappear leaving no traces of their location. Objects in between the safe area and below the 2 meters depth are disengaged, leaving only the part that was in the safe area.
Lastly, SCP XXXX-H has a particular pressure scaling relation, instead of the normal 1 ATM every 10 meters, the pressure in the pit scales in the odd relation of 2.4 ATM every 11.7 meters.
Given the extraordinary ability of SCP XXXX to neutralize objects without leaving track of them, the foundation has a number of protocols to eradicate certain objects and SCPs. The most known protocol is the “Hadal operation” which is used to lure and neutralize sentient objects, named after “Leandro Hadal” or D-0789 was executed using these steps.
[Event Log: “Hadal operation” Accident]
The protocol starts with a group of researchers telling the subject in matter what they are going to do with him to trick it into feeling safe
Dr. ██████: Identify yourself.
D-0789: (with coldness) I’m Leandro Hadal, a Class D.
Dr. ██████: Why are you here?
D-0789: I’m here to explore the inner part of an unknown SCP.
Dr. ██████: You are right, now, what are you exactly going to do to explore it?
D-0789: You guys are going to put me inside a circular vehicle, then I’m going to descend into it.
Dr. ██████: Ok, we are ready, proceed to enter this SCP chamber.
Two guards take D-0789 into the vehicle and then into the chamber.
Dr. ██████: *From outside the room* the vehicle that you are using is equipped with microphones and a tracker, so you are completely safe.
D-0789: *Remains speechless*.
Dr. ██████: (to the staff) we are now starting experiment 004L on SCP XXXX-H, proceed to submerge the vehicle.
Guards move the spherical Vehicle into the water
Dr. ██████: ensure the vehicle is completely submerged (Guards supervise the vehicle).
Guard: The vehicle is completely underwater.
Dr. ██████: Roger that, now exit the containment chamber and seal the entrance properly.
Guards exit the room
Dr. ██████: please, proceed to turn off the lights in XXXX chamber to start the descent, (to D-0789) we are going to start the descent so be prepared.
D-0789: *Remains speechless*.
The light inside the chamber goes down and the remote tracker in the researcher’s room show how the vehicle starts to dive into the depths of SCP-XXXX-H
Dr. ██████: (Only to the staff) the subject is below two meters, please proceed to turn on the lights.
The lights in the researcher’s room went down
Dr. ██████: Wait, what happened?
…
Staff member: (Quickly opens the door) Dr. ██████!! It seems like we are having an electric power cut, most of the facility systems cannot be operated right now, please stand by, it will fixed soon.
Dr. ██████: … (horrified) Hurry up!! We have to turn on the lights in this place.
The remote tracker shows how the vehicle in which Hadal is now quickly submerges
Dr. ██████: someone go and open the entrance of SCP XXXX chamber!!
Staff member: There is the possibility of a containment breach, so we are not authorized to do that Doctor.
Dr. ██████: #@%&!!
The Tracker shows that the vehicle is reaching the depth of 500 meters
Dr. ██████: *Stares at the tracker’s screen*
Inside the vehicle
D-0789: this is place is uncomfortable.
…
25 minutes of silence
[Audio File Corrupted]
[Analysis of recovered audio Files:]
D-0789 “Leandro Hadal” started to make incomprehensible sounds when he surpassed the depth of 2500 meters, it is hypothesize that after that depth, the water pressure started to crack and flood inside the vehicle slowly, breaking the microphone and making him enter a state of narcosis. Some of the phrases we could gather from his incomprehensible speech were “I’m sorry”, “I didn’t want to know that”, “It’s not my fault” and “let me break free”. After 1 hour in the descent, the signal and transmission from the vehicle disappeared.
D-0789 was a very hostile subject, summing up seven attempts to escape the facility and he knew [DATA EXPUGNED], an Infohazzard.
