Submarine commander Dick O'Kane participated in the most successful attacks on Japanese ships during World War II, until his luck, and the last torpedo he fired, took a dramatic turn. We track O'Kane's successful career, first as a protege aboard the legendary USS Wahoo, and then as Commander of the short-lived but lethal USS Tang. Through expert testimony, we relive O'Kane's seminal triumphs, and the tragic path of his last warhead.