<th height="30" style="background-color: #B0C4DE; text-align: center; vertical-align: middle;">Career </th>
<th style="background-color: #B0C4DE; text-align: center; vertical-align: middle;"></th><tr valign="top"><td>Builder:</td><td>
Portsmouth Naval Shipyard, Kittery, Maine</td></tr><tr valign="top"><td>Laid down:</td><td>
14 September 1942</td></tr><tr valign="top"><td>Launched:</td><td>
20 January 1943</td></tr><tr valign="top"><td>Commissioned:</td><td>
4 June 1943</td></tr><tr valign="top"><td>Fate:</td><td>
Missing north of Sulawesi after 2 December 1943</td></tr>
<th colspan="2" height="30" style="background-color: #B0C4DE; text-align: center; vertical-align: middle;">General characteristics </th></tr><tr valign="top"><td>Class & type:</td><td>
Balao-class diesel-electric submarine</td></tr><tr valign="top"><td>Displacement:</td><td>
1,526 long tons (1550 tonne) surfaced
USS Capelin (SS-289), a Balao-class submarine, was the only ship of the United States Navy to be named for the capelin, a small fish of the smelt family. Her keel was laid down by Portsmouth Navy Yard. She was launched on 20 January 1943 sponsored by Mrs. I.C. Bogart, and commissioned on 4 June 1943, Lieutenant Commander E.E. Marshall in command.
Capelin sailed from New London, Connecticut, on 3 September 1943, bound for Brisbane, Australia, and duty with Submarine Force, Southwest Pacific. Her first war patrol, conducted in the Molucca Sea, Flores Sea, and Banda Sea between 30 October and 15 November, found her sinking a 3127-ton Japanese cargo ship on 11 November off Ambon Island.
Capelin returned to Darwin, Australia, with a defective conning tower hatch mechanism, excessively noisy bow planes, and a defective radar tube. These flaws were corrected, and Capelin put out on her second war patrol 17 November 1943, in the Molucca Sea and Celebes Sea, and she was to pay particular attention to Kaoe Bay, Morotai Strait, Davao Gulf, and trade routes in the vicinity of Siaoe Island, Sangi Island, Talaud Islands and Sarangani Island. She was to leave her area at dark 6 December.
Capelin was never heard from again. Bonefish (SS-223) reported having seen an American submarine on 2 December 1943 in the area assigned to Capelin at that time. The Navy broke radio silence on 9 December, but without success.
Japanese records studied after the war listed an attack by minelayer Wakataka on a supposed United States submarine on 23 November, off Kaoe Bay, Halmahera, with the Japanese ship noting the attack produced oily black water columns that contained wood and cork splinters and later a raft was found. This is the only reported attack in the appropriate area at that time. Also, Japanese minefields are now known to have been placed in various positions along the north coast of Sulawesi (Celebes) in Capelin's area, and she may have been lost because of a mine explosion. Gone without a trace, with all her crew, Capelin remains in the list of ships lost without a known cause.
- ↑ 1.0 1.1 1.2 1.3 Friedman, Norman (1995). U.S. Submarines Through 1945: An Illustrated Design History. Annapolis, Maryland: United States Naval Institute. pp. 285–304. ISBN 1-55750-263-3.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Bauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775–1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 275–280. ISBN 0-313-26202-0.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 U.S. Submarines Through 1945 pp. 305–311
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