![Boyka: Undisputed IV](https://silyx.top/storage/2019/07/mWiqc87iTs1qujxm2Q0NRzGvWSN-185x278.jpg)
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.