This is a particularly ridiculous film in just about every way. If you can overlook the utterly weak swiss cheese of a story, the astonishing incompetence of the captain and all of the Japanese, the notion of a woman POW in a men's prison camp, the inability of two dozen Japanese ships to spot a periscope, the unawareness of the Navy that a sub is not a ship but a boat, and that the battle the film is supposed to be about doesn't happen until eighty minutes in, it provides passable entertainment.