| Shipwrecks |
- 1 May: U-277
- 2 May: U-674, U-959
- 3 May: USS Donnell, U-852
- 4 May: U-371, U-846
- 5 May: USS Fechteler
- 6 May: U-66, U-473, U-765
- 7 May: HMCS Valleyfield
- 9 May: USS PC-558
- 10 May: Karukaya, Totila
- 11 May: USS YF-415
- 13 May: Ro-501
- 14 May: America Maru, Inazuma, U-1234
- 15 May: U-731
- 16 May: I-176
- 17 May: U-616
- 19 May: I-16, U-960, U-1015
- 21 May: USS LST-353, USS LST-480, U-453
- 22 May: Asanagi, Hashidate, Ro-106
- 23 May: Ro-104
- 24 May: Ro-116, U-675
- 25 May: U-476, U-990
- 26 May: Ro-108
- 27 May: U-292
- 28 May: UJ 2210
- 29 May: USS Block Island, U-549
- 31 May: Ishigaki, Kotaka, Ro-105, U-289
- Unknown date: U-240
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