| Kapal tenggelam |
- 1 Apr: Lubiana
- 2 Apr: Melbourne Star, U-124
- 5 Apr: Ro-34, U-167, U-635
- 6 Apr: U-632
- 7 Apr: missing name, missing name, U-644
- 8 Apr: missing name, U-733
- 9 Apr: Isonami
- 10 Apr: missing name
- 11 Apr: HMS Beverley
- 14 Apr: missing name, U-526
- 15 Apr: Archimede
- 16 Apr: missing name
- 17 Apr: U-175
- 18 Apr: missing name, missing name
- 21 Apr: Flora Alberta, missing name
- 22 Apr: missing name
- 23 Apr: U-189, U-191, U-602
- 24 Apr: missing name, missing name, U-710
- 25 Apr: U-203
- 26 Apr: Limerick
- 27 Apr: U-174
- 28 Apr: Kamakura Maru
- 29 Apr: U-332, missing name
- 30 Apr: missing name, U-227
- Tanggal tidak diketahui: missing name, U-376
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