| Shipwrecks |
- 1 Apr: HMS Falcon
- 3 Apr: AG-11, AG-12, AG-16, HMS E1, HMS E9
- 4 Apr: HMS Bittern, HMS C26, HMS E8
- 5 Apr: HMS C27, HMS C35
- 7 Apr: Rye
- 8 Apr: HMS E19
- 11 Apr: USS Mary B. Garner, UB-33
- 17 Apr: UB-82
- 18 Apr: Faulx
- 19 Apr: UB-78
- 21 Apr: UB-71
- 22 Apr: Prinz August Wilhelm, UB-55
- 23 Apr: HMS Brilliant, HMS C3, HMS Sirius, HMS Thetis
- 25 Apr: U-104
- 29 Apr: Priarial
- 30 Apr: UB-85
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