Sam Cage (Clayton Rohner) and Maj. Callie O'Grady (Chase Masterson) search the base by rappelling in via helicopter during stormy weather.

Cage sees what appears to be another survivor and starts a chase through the corridors, taking an elevator down to the second level.

When Maj. O'Grady collapses because of the gases in the mine he takes her to an elevator, only to discover they are actually on the fourth level.

Back in the main compound they discover that a body they had found in the snow has now moved and is gone.

Soon Jennifer and Sam find themselves the only ones still alive, fighting the undead and their diabolical master.