| Navy | The Royal Navy |
| Type | Submarine |
| Class | Porpoise |
| Pennant | N 83 |
| Built by | Scotts Shipbuilding & Engineering Co. (Greenock, Scotland) |
| Ordered | 5 Mar 1936 |
| Laid down | 12 May 1936 |
| Launched | 2 Dec 1937 |
| Commissioned | 15 Aug 1938 |
| Lost | 30 Jul 1941 |
| Loss position | 32.49N, 20.11E |
| History | HMS Cachalot (Lt. Hugo Rowland Barnwell Newton, DSO, RN) was rammed and sunk about 45 nautical miles north of Benghazi, Libya in position 32º49'N, 20º11'E by the Italian torpedo boat Generale Achille Papa. Cachalot was attacking the Italian merchant Capo Orso (3149 GRT) with gunfire when she was rammed and sunk by it's escort. |
Commands listed for HMS Cachalot (N 83)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Sydney William Floyd Bennetts, RN | 26 Aug 1937 | 15 Jun 1940 |
| 2 | Lt.Cdr. John David Luce, RN | 15 Jun 1940 | 21 Feb 1941 |
| 3 | Lt. Hugo Rowland Barnwell Newton, DSC, RN | 21 Feb 1941 | 30 Jul 1941 |
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Noteable events involving Cachalot include:
19 Aug 1940
HMS Cachalot (Lt.Cdr. J.D. Luce, RN) lays minefield FD 24 (50 mines) west of the Gironde estuary.
20 Aug 1940
German U-boat U-51 was torpedoed and sunk in the Bay of Biscay west of Nantes, France in position 47°06'N, 04°51'W, by a torpedo from the British submarine HMS Cachalot (Lt.Cdr. J.D. Luce, RN). (see map)
23 Sep 1940
The German auxiliary minesweeper M 1604 / ?sterreich (494 GRT) sank after hitting a mine laid by HMS Cachalot (Lt.Cdr. J.D. Luce, RN) off Penmarch, France in position 47°52'N, 04°19'W. The mine was one of field FD 27 (50 mines) laid that day by HMS Cachalot. (see map)
24 Sep 1940
HMS Cachalot (Lt.Cdr. J.D. Luce, RN) attacks a submarine with torpedoes in the Bay of Biscay in position 46°58'N, 05°56'W. The target is not hit. (see map)
26 Jan 1941
HMS Cachalot (Cdr. J.D. Luce, DSO, RN) lays minefield FD 28 (50 mines) off Bud, Norway.
15 Feb 1941
HMS Cachalot (Cdr. J.D. Luce, DSO, RN) lays minefield FD 30 (50 mines) in the Vest Fjord, Norway.
The same day she also makes a torpedo attack on a merchant ship but without result.

