At Research Station 320 one mile beneath the Antarctic surface something has gone terribly wrong. All communications are gone, all means of escape destroyed and a deadly horde of ravenous creatures is on the loose. Now 8 survivors must barricade themselves inside a remote area of the facility with little food, almost no means of defense and no hope of rescue. Their one possible escape route is through 13 levels of terror that will lead them to the surface ....if they can make it.