| Shipwrecks |
- 2 May: UB-31, Unity
- 5 May: Kyarra, UB-119
- 8 May: U-32
- 9 May: UC-78
- 10 May: UB-16, HMS Vindictive
- 11 May: Sant Anna, U-154, Verona
- 12 May: U-103, UB-72
- 13 May: UB-114, Zaanland
- 14 May: HMS Phoenix
- 17 May: U-35
- 18 May: Catapulte, Warrimoo, HMS Chesterfield
- 21 May: Rosalind
- 23 May: Innisfallen, HMS Moldavia, UB-52
- 26 May: UB-74
- 31 May: HMS Fairy, USS President Lincoln, UC-75
- Unknown date: UB-70
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