Something lurks in the waters off the South Carolina coastline. The local newspapers are riddled with stories of washed up sharks and whales, but are quickly debunked as nothing more than boating accidents.

Until the attack on the Tiernan Blue Shipping Company vessel...

Dispatched for marine repairs, the crew thinks this will be a job like any other until their boat is struck by something below. Automatically, a distress signal is sent out.

Upon hearing the distress signal, a team of Navy seals rush to the vessel's aid. Diving to the depths they come face to face with true terror. With time running out can they evacuate the ship before the creature strikes again?