It’s Independence Day, 1942, and a brand new sub, U.S.S. Grunion, sets sail from Midway for her first combat mission with 70 men aboard. The crew are doubtless hopeful that July 4th is an auspicious date to go to war against the Japanese enemy. But, at the end of July, their tour is to have the worst ending possible. Somewhere in the Bering Sea the Grunion and her crew of 70 disappear. And it would be decades before their fate was revealed.