Dragonhead on AllMovie

The teenage survivors of a collapsed train tunnel crawl out of the wreckage to make a horrifying discovery that will change their lives forever in this apocalyptic sci-fi-disaster effort from Rasen director Joji Iida. Teru Aoki is returning home on the express train from a school trip when, after entering into a tunnel, the walls come crumbling down around him. Though most of Teru's classmates perished in the accident, Ako Seto and Nobou Takahashi have survived and the three desperately claw their way to the surface only to discover that all of Tokyo has been devastated by an unexplained disaster. As the frightened trio attempt to make their way back to Tokyo, they meet with other survivors and struggle to carry on in a world gone to ruin.