In the dark waters of the Gulf of Mexico, several great white sharks complicate things for a secret U.S. military mission. Once enough sailors are lost to the surprisingly cunning beasts, MIT drop-out marine biologist Robin (Simmone Jade Mackinnon) and renegade fish expert Dane (Lorenzo Lamas) are taken to a classified submarine where they are to help the Marines get rid of the dorsal-finned predators. But there's more than that happening on the sub, and before long Dane and Robin don't know the good guys from the sharks. Bullets fly, sharks attack.