When a frenzy of five Megalodons torment the open ocean, the stakes have never been higher.

When a Chinese submarine discovers the existence of a giant megalodon shark in the waters off San Diego, a battle for survival ensues as the massive creature goes on a rampage, attacking both the submarine and anything else in its path. As the navy and local authorities struggle to contain the threat, a group of scientists, led by a renowned shark expert, must find a way to stop the relentless predator before it destroys everything in its wake.

When a Russian woman is kidnapped by an escaped prisoner, a military submarine Captain must lead his crew on a dangerous mission to rescue her. However, their mission takes a deadly turn when they encounter a massive prehistoric shark, the Megalodon, that threatens their lives and the lives of everyone on board. As they struggle to survive, they must come up with a plan to outsmart and defeat the monstrous creature before it devours them all.