~...An industry so deep...~

-'One day, a large sheet of ice in the Arctic broke off, uncovering a large industrial building which seems to go deep, deep into the earth. Nobody knows what its purpose is, nor how it came to be, however it is seemingly running, as smog billows out of the smokestacks on top...'-

[og map from garry's mod, this is not an original thing. Go play Vacant Industry.]

Basically... good luck exploring or fixing PRISMS.