Rotting Fog
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Photograph of SCP-XXX taken from perimeter of containment zone.

Item #: SCP-XXX

Object Class: Keter

Special Containment Procedures: SCP-XXX is currently contained on site of initial discovery, covering an approximate distance of 63x70 square miles at the small town previously known as [DATA EXPUNGED].

It is to be surrounded at all times with a high-strength, corrosion resistant fencing measuring four (4) inches in thickness. Fence is to be checked for any signs of damage on a weekly basis, any signs of damage are to be repaired upon discovery and the surrounding area is to be investigated for containment breaches. Any containment breach detected will result in an immediate lockdown of the surrounding area until any threat has been successfully neutralised.

High-pressure fans are to be stationed at every one (1) mile interval along the internal boarder of the fence and are to be initialised if SCP-XXX begins to spread beyond its standard limits. These fans are to be maintained on a bi-weekly basis and checked for any damage.

The only personnel permitted to enter this containment site are Level 5 staff members or D class personnel for testing and maintenance procedures. All D class personnel are to be monitored at all times via remote supervision and are not permitted to exit the containment site after entry to prevent potential spreading of SCP-XXX.

Any instances of SCP-XXX detected beyond the containment zone are to be locked down and quarantined immediately upon discovery. If possible, all elements of SCP-XXX in these lock down zones is to be destroyed.

Description: SCP-XXX appears to be a large area of black, gaseous substance similar to common mist or fog. This fog is heavier than air and has not been seen to exceed above 5 meters in height, but is capable of spreading on a horizontal plane at a gradual but relentless pace. Initial site of discovery was overwhelmed within 3 weeks of initial exposure.

SCP-XXX can apparently spread indefinitely, a small sample contained in a 2 oz canister was able to totally fill a 3 x 3 meters cubed room when released. For this reason, the prevention of security breaches is of top priority.

The gas of SCP-XXX has a number of adverse effects on various substances as well as living organisms. When exposed to SCP-XXX, a living organism will begin to exhibit a number of symptoms including (but not limited to) paralysis, rapid tissue decomposition, organ failure, blindness and eventually death (see testing log XXX-00231-234D for full report.) After the infected victim of SCP-XXX has expired, the gas will be continually emmited from the victim's body and continue to spread for up to 9 hours. It is believed that this is the original cause of the outbreak at the original site.

In addition to these symptoms, exposure to SCP-XXX has shown to have a neurological effect on its victims. After 10 - 13 hours of exposure, victims of SCP-XXX will attempt to gain access to as many other living organisms as possible and will cough up small secretions of SCP-XXX. At this stage of infection, victims of SCP-XXX appear delirious, highly distressed and unresponsive to most stimulus including pain and blood loss. It is suspected that this behaviour is SCP-XXX attempting to use its victims as carriers to further spread itself, suggesting a kind of sentience.

When exposed to non-living materials such as rock, brick, concrete, wood and metals weaker than titanium, SCP-XXX exhibits a highly corrosive effect, able to deteriorate and decay objects, structures and terrain to an astonishing degree. A standard sized house constructed of brick, metal and wood can be reduced to a ruin within 3 days of total exposure. Curiously, this effect does not occur on living organisms, but will affect items such as clothing and equipment being worn or used by a living subject.

Despite at first appearing directionless, SCP-XXX has shown the ability to "target" living organisms. It will alter its direction and flow, defying low pressure air currents and terrain in order to reach and infect subjects. This targeting phenomenon has been seen to effect any living organism within a 1 mile radius of SCP-XXX. This targeting process can be stopped via the application of high-pressure winds that stop its flow. This behaviour compounds the suggestion of sentience, the mist actively seeking out "prey" in which to infect and spread itself with.

Attempts to destroy SCP-XXX have revealed that the gas can be significantly reduced via the application of extremely high temperatures. Any temperature over 2000°C is apparently able to reduce the mass of SCP-XXX considerably. Extended periods of exposure to this temperature have shown able to totally destroy the gas. Requests to eliminate the main body of SCP-XXX with high-temperature incendiary strikes are currently pending.

Cold temperatures (anything below -10°C) have shown able to slow the spread of SCP-XXX, this has proven useful to help control testing, but is not a viable method of large-scale containment.

Testing Log XXX-00231-234D:

Security footage still of subject 00000234D, 10 hours post exposure to SCP-XXX.

Subject 00000234D is exposed to a small sample of SCP-XXX and monitored over a course of 24 hours:

[Initial exposure]:
Subject coughs a few times as SCP-XXX enters his body through the mouth and requests several times to know what he has been exposed to. After being denied an explanation, subject becomes agitated for approx 10 minutes and paces nervously. After a period of 15 minutes, subject settles and takes up station on a seat in the testing room. Reports that he "Feels fine." when questioned by supervisors.

[2 hours]:
Subject begins to complain of mild pain in the head and stomach as well as a "tingling" feeling in his fingertips and toes. However, no visual abnormalities are present. Subject requests pain medication several times and begins to verbally insult supervising staff after having the requests denied. Subject is subdued with mild shock from electric collar.

[5 hours]:
Subject begins to complain that the pain in his stomach and head has grown worse and that he feels pain in his chest and throat. Also complains of numbness in fingers and toes. Speech appears mildly impaired at this stage, but still no visual symptoms occur.

[6 hours]:
Subject begins to exhibit a twitching in the fingers, hands and legs, as well as eyes and mouth. When questioned, subject's response is slurred and almost incomprehensible, but he expresses distress, reports "A lot of pain." and begins to beg for help. This continues for approx 30 minutes before subject becomes catatonic.

[8 hours]:
Subject complains in what is described as a "pleading tone" that his vision and hearing becoming impaired as well as "A rotten taste." However, it is difficult to discern much beyond this as it becomes apparent that the subjects eyes and tongue are rapidly decomposing. Subject begins to bleed from the eyes, mouth and ears and shows signs similar to gangrene around the hands and feet.

[9 hours]:
Subject becomes highly distressed and begins to stagger about the containment room and attempting to communicate. After 10 minutes of this, subject collapses, but continues to attempt communication. A further 5 minutes after this, the subject begins to convulse violently and eventually loses consciousness.

[10 hours]:
Subject suddenly snaps back into consciousness and manages to crawl to his feet. Subjects eyes and mouth are now visibly decomposed beyond repair, as are fingers and toes as well as areas of the chest and back. Regardless of this, subject begins to pace and attempt communication, exhibiting large amounts of distress and discomfort.

[12 hours]:
Subject begins attempting to exit the containment room, first trying to leave via the door. Subject shows proficiency enough to try and use the door handle and begins to beat against and assail the door when it does not open. This persists for approximately 15 minutes - large amounts of damage being done to the subjects hands and arms through the constant assaulting of the door. Subject then moves to the observation window and begins to attack it violently, apparently attempting to break it and exit.

[13 hours]:
Subject begins to cough and gag repeatedly, but this does not hinder attempts to leave the room. Small secretions of additional SCP-XXX clouds can be seen from the coughs. These secretions quickly begin to spread through the room, but are removed via high-pressure vacuum vents in order to keep the room clear for observation.

[21 hours]:
Subject collapses, arms having been effectively destroyed below the elbows due to a combination of decomposition and constant assaults against the surroundings. Subject continues to convulse and cough despite being apparently unable to move his legs. Face and chest are now significantly rotted. Subject is no longer identifiable by facial features.

[24 hours]:
Subject's vital signs stop and decomposition rate returns to normal. SCP-XXX gasses continue to be emitted by the corpse of the subject for 9 hours until the body is incinerated.

Addendum XXX-11-01: Object Class upgraded to Keter after review of results from testing, refer to document 10-XXX-02379-BG-A for details.

Addendum XXX-11-02: After the loss of another 10 D class personnel during an investigation into the town, investigation squads into the site are no longer permitted.

Addendum XXX-11-03: We tried the idea of sucking all the gas out of the town with a giant vacuum into a huge furnace to destroy it, but it turns out the stuff just spread too quickly. An area that large needs to be destroyed all in one hit, personally, I suggest we just firebomb the whole place and be done with it.

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