In the near future, in the vast waters of the ocean rude terrorist group known as the USR (Undersea Silence Revolution).At the head of this group, is Red Admiral, obsessed with conquering the world - attacking all naval vessel. To combat the terrorist threat, the organization of PKN (Peace Keep Navy) was established to maintain order, peace and the suppression of acts of aggression. PKN leaders collected a fleet of modern warships and other countries.Each country sent the best submarine, with the exception of Japan - 707 submarine, old, run-down pile of metal. On the same day of the ceremony - the establishment of peacekeeping fleet when all the ship at a glance, the fleet in the collection, and the weather smiles -Admiral Red decides to take advantage of this great opportunity to inflict a preemptive strike on the fleet PKN. But all would be nothing if it were not... 707 submarine and its crew... in whose hands remains the fate of the world.