The film is famous for the "squeeze" scene where Sarah gets stuck in a tunnel. In Hindi, the internal monologue of "मैं साँस नहीं ले सकती" (I can’t breathe) is far more haunting than reading it silently.

The group soon discovers that the creatures are not just mindless beasts, but are actually the product of a genetic mutation that has occurred over thousands of years. The creatures are fast, agile, and almost impossible to kill. As the group tries to survive, they begin to turn on each other, and tensions rise.