SCP-874 is a black, largely unreflective fluid with 30.87 cP viscosity and reflectivity less than a tenth of that of water. When it approaches a static depth of 2 cm, the fluid functions as a portal to a seemingly infinite space. Telemetry into the abyss has led to no conclusive results as to its dimensions. Audio readings and personnel report the sound of distant grinding of metal and stone from this portal. Occasionally, viewers and visual recording equipment can glimpse what appears to be immense rotating ███████ drifting aimlessly in the otherwise featureless blackness.