Movie Story : When a massive sinkhole swallows a small town, a school bus full of students plunges deep underground. The vehicle comes to rest hanging against the wall of the hole, held only by a broken pipe, so any sudden movement could send it crashing into the darkness. With the adults injured, the teenagers must fend for themselves, and their fragile order begins to unravel in a way that echoes Lord of the Flies. Their only hope rests with a local paramedic who must confront a painful past to reach them.