The Allied invasion of the Philippines signals the beginning of the end for Japan. In a desperate gamble, a renegade admiral launches the Sen-Toku class submarines-designed to carry kamikaze aircraft and manned torpedoes-on a desperate mission to strike Washington, D.C.

Underwater Demolition Team operative Lieutenant Charlton Randall and a rag-tag band of Allied soldiers and guerrillas have one choice: destroy the sea base housing the Sen-Toku submarines-or die trying.