Following shakedown, Sealion, assigned to Submarine Division 17 (SubDiv 17), prepared for overseas deployment. In the spring of 1940, she sailed, with her division for the Philippine Islands, arriving at Cavite in the fall to commence operations as a unit of the Asiatic Fleet. Into October 1941, she ranged from Luzon into the Sulu Archipelago, then, with her sister ship Seadragon, another submarine in SubDiv 202, she prepared for a regular overhaul at the Cavite Navy Yard. By 8 December, her yard period had begun; and, two days later, she took two direct hits in the Japanese air raid which demolished the navy yard.
The first bomb struck the aft end of her conning tower and exploded outside the hull, over the control room. The second smashed through a main ballast tank and caused the pressure hull to explode in the aft engine room, killing the four men, Sterling Cecil Foster, Melvin Donald O'Connell, Ernest Ephrom Ogilvie, and Vallentyne Lester Paul, then working there. In addition, one crewman, Howard Firth, died while a POW.
Sealion flooded immediately and settled down by the stern with 40% of her main deck underwater and a 15-degree list to starboard. The destruction of the navy yard made repairs impossible, and she was ordered destroyed. All salvageable equipment was taken off, depth charges were placed inside, and on 25 December, the explosives were set off to prevent her from being made useful to the enemy.
Successor
Eli Thomas Reich, who was executive officer and engineer on Sealion when it was sunk, assumed command of the second Sealion (SS-315) in March 1944. Four of the six torpedoes that Sealion II fired to sink the Kongō carried the names Foster, O'Connell, Paul and Ogilvie—the men who had been killed in the bombing of the first Sealion three years earlier.
In popular culture
The sinking of Sealion was incorporated into the plot of the 1959 Cary Grant film Operation Petticoat, where the fictional submarine Sea Tiger, also based at Cavite, suffers a similar fate, although in the film she is re-floated and ordered to Cebu for a complete refit, thereby setting the stage for the film's storyline.
^ abcdefgBauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775–1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 269–270. ISBN0-313-26202-0.
^ abcdefghijklmnU.S. Submarines Through 1945 pp. 305–311