Crime takes a dive in this week's episode of old time radio mysteries involving submarines, salvage divers, and the mysterious ocean floor. First, a love triangle leads to death at sea in "Dark Voyage" from The Whistler (originally aired on CBS on April 9, 1950). Then, Herbert Marshall hunts for a submarine targeting ships off India as The Man Called X (originally aired on NBC on February 3, 1951). And finally, G-men are on the job when a Nazi submarine drops off enemy agents in "The Saboteurs" (originally aired on ABC on March 30, 1951).