Summary
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A group of five college friends sign up for a guided swim through a remote cave system, known as The Devil's Mouth, along Thailand's stunning coast for one last adventure before life in the real world begins. But their quest for fun soon turns into a desperate, deadly fight for survival when they become trapped in the submerged caves and discover a dangerous, bloodthirsty bull shark that starts to pick them off one by one. As oxygen runs low in the suffocating darkness, trust erodes, past conflicts emerge, panic spreads and every wrong turn becomes a desperate fight for survival.
Source: Wikipedia (CC BY-SA 3.0)