| Shipwrecks |
- 1 May: Erinpura
- 2 May: Gneisenau, Turunmaa, U-465
- 4 May: U-109, U-439, U-659
- 5 May: Bristol City, Fingal, Hartwelson, U-638, West Madaket, West Maximus
- 6 May: FR 117, U-125, U-192, U-438, U-531, U-630
- 7 May: Adele, Hermes, U-447, U-663, L'Audacieux
- 8 May: Kagerō, Kuroshio, Oyashio
- 9 May: Aso Maru
- 11 May: Nailsea Meadow, U-528
- 12 May: I-31, U-89, U-186, U-456
- 13 May: U-753
- 14 May: AHS Centaur, Ro-102, U-235, U-236, U-237, U-640
- 15 May: Irish Oak, U-176, U-266
- 16 May: Enrico Tazzoli, U-182, U-463
- 17 May: U-128, U-646, U-657
- 18 May: Empire Eve
- 19 May: Général Bonaparte, U-273, U-953
- 20 May: U-258
- 21 May: U-303
- 22 May: U-569
- 23 May: Leonardo da Vinci, USS Niagara, U-752
- 25 May: U-414, U-467
- 26 May: U-436
- 27 May: Léopard
- 28 May: U-304, U-755
- 30 May: HMS Untamed
- 31 May: U-440, U-563
- Unknown date: Calypso, U-209, U-381
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