After DVD

Getting caught is the least of their fears.

Nate, grief-stricken over the death of his young son, jets off with his wife Adrian and her brother Jay to Moscow to do some urban exploration, the practice of investigating areas not designed for public use. Their adventure through Moscow's underworld, Ivan the Terrible's torture chambers, Soviet bomb shelters and Stalin's fabled Metro-2 subway system turns into a nightmarish journey when they're trapped underground and the lines between fantasy and reality become blurred.