| 1938 | 1938 - 1978: Forth (F04) | Launched |
| 1941 | Unsparing (P55) | Laid Down |
| 1944 | Giuseppe Dormio | The Italian steamship Giuseppe Dormio was torpedoed and sunk by a British submarine on between Pola and Fiume in the Adriatic. |
| 1944 | Vivid (P77) | HMS Vivid attacks the small German merchant Toni between Milos and Suda Bay. The attack is unsuccesful. |
| 1944 | Scythian (P237) | Completed |
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| Built By: | Vickers (Barrow) | Build Group: | G2 |
| Fate: | |
| Narwhal left Blyth on 22nd July 1940. On the afternoon of 23rd July, an aircraft reported attacking a submarine in the area where Narwhal should have been. Narwhal did not report again, it was assumed this attack sank the submarine with all hands. | |
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