| Shipwrecks |
- 4 Apr: Giovanni Acerbi, Lichtenfels, Liebenfels, Proussa
- 5 Apr: U-76
- 7 Apr: Clan Fraser
- 8 Apr: Vincenzo Giordano Orsini
- 12 Apr: Drava, Morava, Sava, Vardar
- 13 Apr: Corinthic, HMS Rajputana
- 16 Apr: HMS Mohawk
- 17 Apr: Zagreb
- 20 Apr: Empire Endurance, Ithaki, Psara, Vasilefs Georgios
- 21 Apr: Thyella
- 22 Apr: Frinton, Hydra, Sea-Serpent
- 23 Apr: Alberta, Kilkis, Kios, Lemnos
- 24 Apr: Simone Schiaffino
- 25 Apr: Kyzikos, Pennland, Pergamos
- 26 Apr: Kydoniai
- 27 Apr: Costa Rica, HMS Diamond, Slamat (disaster), HMS Wryneck
- 28 Apr: U-65
- 29 Apr: City of Nagpur
- Unknown date: HMS Usk
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