The Cave (2005)

After a group of biologists discovers a huge network of unexplored caves in Romania and, believing it to be an undisturbed eco-system that has produced a new species, they hire the best American team of underwater cave explorers in the world. While exploring deeper into the underwater caves, a rockslide blocks their exit, and they soon discover a larger carnivorous creature has added them to its food chain.

The Cave keeps every mind human — it fights its subject at zero distance. The story fights on E8/E6 of the E0–E14 reality ladder, compressing parasite, mutation, survival, isolation, fear.