Object Class: Euclid

Special Containment Procedures: SCP-XXXX possesses size and properties that render transportation to a Foundation containment site impossible; For this reason, a Foundation security perimeter has been established around SCP-XXXX's current location. A wall composed of hardened concrete and cement block measuring 50 ft (15.24 m) in height is to be maintained around the perimeter of SCP-XXXX, with 30 ft (9.14 m) of concrete flooring between the edge of SCP-XXXX and the interior side of the wall. Within this wall, SCP-XXXX is to be surrounded by a chain-linked fence 6.56 ft (2 m) in height and topped with barbed wire. The security perimeter is to be monitored by six (6) on-site security officers. Two (2) of these officers are to stand at either side of the perimeter vehicle entrance, two are to patrol along the top of the wall, and two are to guard the inside of the facility. Directly opposite the vehicle entrance, an observation laboratory is positioned atop the wall.

Description: SCP-XXXX is a large lake composed of an unknown waterlike liquid inhabiting the Mongolian-Manchurian grassland ecoregion, measuring roughly 0.3 square miles (0.48 square kilometers) in surface area, although it is hypothesized to have once been significantly smaller. At present, SCP-XXXX is surrounded by a private Foundation security perimeter and closed off to civilian travelers. The amound of liquid composing SCP-XXXX is immeasurable, partially because of the fact that its floor has yet to be located: As depth-sounding investigations have returned no echoes, SCP-XXXX is believed bottomless. Individual samples of SCP-XXXX possess the same attribute, even when placed in finite measured containers, in defiance of understood physics.

When any living matter is partially or entirely submerged in SCP-XXXX's body or into an individual sample of SCP-XXXX, it will become impossible to move the matter above the surface: Subjects with immersed limbs will treat the surface of the liquid as if it is solid material, and persistent attacking of the threshold can lead to injury upon the limb. The living matter can, however, be immersed more deeply or entirely into the liquid.

Upon being immersed into SCP-XXXX, a phenomenon comparable to dissolving will take effect on living matter. Submerged matter will be worn down by the surrounding liquid from the exterior inwards: Recorded testing sessions have captured skin flaking off gradually until exposure of the entire muscular system is achieved. Disembodied dermal matter will diffuse as it rises to the surface. Unlike the loss of skin — which appears to be relatively painless — very extreme reactions will occur in subjects as the bare tissue wears away. In spite of attempts at screaming and vocalizing by subjects experiencing this stage, it appears impossible to drown in SCP-XXXX. Blood of the subject will heavily cloud the water as this erosion persists, and for this reason, it has not been determined if SCP-XXXX disposes of bone or cartilage.

Upon disappearance of the subject, samples of SCP-XXXX will visibly rise in water level. Studies conducted by placing samples in measured containers find that SCP-XXXX samples will grow in volume after consumption of subjects; The volume grown has been found to be equal to the physical volume of living matter immersed within prior to analysis.