| Shipwrecks |
- 1 Apr: Awa Maru
- 2 Apr: CD-186, USS Dickerson, U-321
- 3 Apr: Brummer, USS S-16, U-1221, U-2542, U-3505, T111
- 4 Apr: USS Dickerson, U-237, U-749, U-3003
- 5 Apr: U-242, USS S-17
- 6 Apr: Amatsukaze, USS Bush, USS Colhoun, USS Leutze, USS Morris, USS Newcomb, USS Witter, SS Hobbs Victory, SS Logan Victory
- 7 Apr: Asashimo, Hamakaze, Isokaze, Isuzu, Kasumi, USS LST-447, Oldenburg, USS PGM-18, U-1195, Yahagi, Yamato
- 8 Apr: U-774, U-1001
- 9 Apr: Admiral Scheer, Ro-56, U-677, U-747, U-804, U-843, U-982, U-1065, U-2509, U-2514, U-3512, U-2516
- 10 Apr: U-878, Weser
- 12 Apr: USS Mannert L. Abele, Ro-64, U-486
- 13 Apr: Karlsruhe, U-1024
- 14 Apr: Belgian Airman, U-235, U-1206
- 15 Apr: U-103, U-285, U-1063, U-1235
- 16 Apr: HMCS Esquimalt, Lützow, USS Pringle, U-78, U-880, U-1274
- 17 Apr: Goya
- 19 Apr: Aquila, U-251, U-548, U-879
- 21 Apr: U-636
- 22 Apr: USS Swallow, U-518
- 23 Apr: USS Eagle Boat 56, U-183
- 24 Apr: USS Frederick C. Davis, U-108, U-546
- 25 Apr: Graf Zeppelin, Ro-109, TA 32, U-326
- 27 Apr: Canada Victory, TA 34
- 28 Apr: CH-17, U-56
- 29 Apr: I-44, U-56, U-286, U-307, U-1017
- 30 Apr: HMS Goodall, TA 43, U-879, U-1107
- Unknown date: I-56, Ro-46, Ro-49, USS Snook, U-246, U-325, U-396, U-398, U-548, U-857, U-1055
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