A Balao-class submarine with normal fuel capacity of 54,000 gallons, and an emergency load of 116,000 gallons. She made eight war patrols sinking three Japanese vessels totaling 7,575 tons. Her first patrol was out of Pearl Harbor in November of 1943. She later patrolled from Majuro to Midway and was part of Operation Galvanic during the invasions of Tarawa and the Gilbert Islands. Working off Formosa, she ran in a wolf-pack known as the "Mickey Finns" that sunk 41,000 tons worth of Japanese vessels toward the end of the war.
She received five battle stars and was sunk by BAKER. She now appears perfectly upright as if ready to drive away on the bottom of Bikini's lagoon. Eric Hanauer of Discover Diving commented, "The shadowy silhouette of Apogon's conning tower, completely enveloped by glassy sweepers, is one of the most beautiful sights I've ever seen underwater."