| Navy | The US Navy |
| Type | Submarine |
| Class | Balao |
| Pennant | 411 |
| Built by | Mare Island Navy Yard (Vallejo, California, U.S.A.) |
| Ordered | |
| Laid down | 27 May 1943 |
| Launched | 8 Jan 1944 |
| Commissioned | 9 Mar 1944 |
| End service | 3 May 1946 |
| Loss position | |
| History | Decommissioned 3 May 1946. |
Commands listed for USS Spadefish (411)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Cdr. Gordon Waite Underwood, USN | 9 Mar 1944 | Feb 1945 |
| 2 | Cdr. William Joseph Germershausen, Jr., USN | Mar 1945 | Jul 45 ? |
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Noteable events involving Spadefish include:
14 Jun 1944
With her trials and initial training completed USS Spadefish (Cdr. Gordon Waite Underwood) departs San Francisco for Pearl Harbour.
22 Jun 1944
USS Spadefish (Cdr. G.W. Underwood) arrives at Pearl Harbour.
23 Jul 1944
USS Spadefish (Cdr. G.W. Underwood) departs Pearl Harbour for her 1st war patrol. She is ordered to patrol in the South China Sea north-west of Luzon, Philippines.
19 Aug 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese landing craft depot and repair ship Tamatsu Maru (9589 GRT) west of Luzon, Philippines in position 18º48'N, 119º47'E. (see map)
22 Aug 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and damages the Japanese tanker Hakko Maru No.2 (10023 GRT) in Luzon Strait in position 18º48'N, 120º46'E. The tanker takes limps to Passeleng Bay where efforts to salvage fail and she broke up in heavy weather on 18 September 1944. Spadefish now set course to Saipan to resupply and then resume her 1st war patrol in the waters east of Formosa. (see map)
8 Sep 1944
While operating east of Formosa USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese troop transport Shokei Maru (2557 GRT) and the Japanese army cargo ship Shinten Maru (1254 GRT) in position 24º39'N, 123º31'E and the Japanese merchant cargo ships Nichiman Maru (1922 GRT) and Nichian Maru (6197 GRT) in position 24º45'N, 123º26'E. (see map)
24 Sep 1944
USS Spadefish (Cdr. G.W. Underwood) ends her 1st war patrol at Pearl Harbour.
23 Oct 1944
USS Spadefish (Cdr. G.W. Underwood) departs Pearl Harbour for her 2nd war patrol, She is ordered to patrol in the East China and Yellow Seas.
14 Nov 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese merchant cargo ship Gyokuyo Maru (5396 GRT) in position 31º04'N, 123º56'E. (see map)
17 Nov 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese escort carrier Shinyo (17500 tons, offsite link) and torpedoes and damages the Japanese landing ship Shinshu Maru about 140 nautical miles northeast of Shanghai, China, in position 32º59'N, 123º38'E. (see map)
18 Nov 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and damages the Japanese auxiliary submarine chaser Cha 156 (130 tons) in the East China Sea in position 33º07'N, 123º19'E.
29 Nov 1944
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese merchant cargo ship Daiboshi Maru No.6 (3925 GRT) in the Yellow Sea off the west coast of Korea in position 37º17'N, 125º11'E. (see map)
12 Dec 1944
USS Spadefish (Cdr. G.W. Underwood) ends her 2nd war patrol at Majuro.
6 Jan 1945
USS Spadefish (Cdr. G.W. Underwood) departs Majuro for her 3rd war patrol. She is ordered to patrol in the Yellow Sea.
28 Jan 1945
While operating in the Yellow Sea USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese frigate Kume (940 tons, offsite link) in position 33º50'N, 122º55'E and the Japanese troop transport Sanuki Maru (7158 GRT) in position 34º02'N, 123º00'E. (see map)
4 Feb 1945
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese merchant cargo ship Tairai Maru (4273 GRT) in the Yellow Sea off the west coast of Korea in position 37º18'N, 125º22'E. (see map)
6 Feb 1945
USS Spadefish (Cdr. G.W. Underwood) torpedoes and sinks the Japanese merchant passenger/cargo ship Shohei Maru (1092 GRT) off Port Arthur, Korea in position 38º46'N, 121º28'E. (see map)
13 Feb 1945
USS Spadefish (Cdr. G.W. Underwood) ends her 3rd war patrol at Guam.
15 Mar 1945
USS Spadefish (Cmdr William Joseph Germershausen, JR.) departs Guam for her 3rd war patrol, and is ordered to patrol in the East China and Yellow Seas.
23 Mar 1945
USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the Japanese troop transport Doryu Maru (2274 GRT) about 120 nautical miles north-north-west of Amami O Shima in position 29º38'N, 127º36'E. (see map)
1 Apr 1945
USS Spadefish (Cdr. W.J. Germershausen) sinks a Japanese sailing vessel with gunfire south of Korea in position 34º23'N, 128º08'E. (see map)
7 Apr 1945
USS Spadefish (Cdr. W.J. Germershausen) sinks a Japanese sailing vessel with gunfire in the Yellow Sea in position 36º01'N, 124º52'E. (see map)
8 Apr 1945
USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the Japanese merchant cargo ship Ritsu Go (1834 GRT) off the west coast of Korea in position 37º21'N, 125º08'E. (see map)
11 Apr 1945
USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the Japanese auxiliary minesweeper Hinode Maru No.17 (235 GRT) off Tokckok-Kundo in position 37º13'N, 125º11'E. (see map)
21 Apr 1945
USS Spadefish (Cdr. W.J. Germershausen) ends her 4th war patrol at Guam.
27 May 1945
USS Spadefish (Cdr. W.J. Germershausen) departs Guam for her 5th war patrol. She is ordered to patrol in the Sea of Japan.
10 Jun 1945
While operating west of Hokkaido in the Sea of Japan USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the Japanese merchant cargo ship Daigen Maru No.2 (1999 GRT) off Otaru in position 43º23'N, 140º39'E, the Japanse troop transport Unkai Maru No.8 (1293 GRT) off Shakotan Mizaki in position 43º55'N, 141º13'E and the Japanese army cargo ship Jintsu Maru (985 GRT) in position 43º28'N, 140º28'E. (see map)
12 Jun 1945
While operating in the Sea of Japan west of Hokkaido USS Spadefish (Cdr. W.J. Germershausen) sinks a Japanese sampam with gunfire in position 44º11'N, 140º31'E, a Japanese trawler with gunfire in position 44º58'N, 141º05'E, the Japanese guardboat Daido Maru (69 GRT) with gunfire in position 45º08'N, 141º10'E and finally another Japanese trawler with gunfire in position 44º50'N, 141º18'E. (see map)
13 Jun 1945
USS Spadefish (Cdr. W.J. Germershausen) mistakenly torpedoes and sinks the Russian passenger ship Transbalt (11439 GRT) west of the La-Perouse Strait in position 45º44'N, 140º48'E. (see map)
14 Jun 1945
USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the Japanese merchant cargo ship Seizan Maru (2018 GRT) off western Sakhalin in position 47º03'N, 142º01'E. (see map)
17 Jun 1945
USS Spadefish (Cdr. W.J. Germershausen) torpedoes and sinks the auxiliary minelayer Eijo Maru (2274 GRT) off Matsuta Misaki, Hokkaido, Japan in position 42º38'N, 139º49'E. (see map)
4 Jul 1945
USS Spadefish (Cdr. W.J. Germershausen) ends her 5th war patrol at Pearl Harbour.
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