The Incredible Petrified World

It's supposed to be cutting edge science: a diving bell that can descend the depths of the ocean. However, when a cable snaps, the crew fears that they may perish inside. After the crew leaves the bell to explore, they soon find a large network of caves and a survivor who has been there for over a decade. The survivor reveals the horrible truth: there is no way to get out of the caves. Or is there a way?