| Shipwrecks |
- 1 Dec: Washington
- 2 Dec: SM UB-81
- 6 Dec: USS Jacob Jones, Mont-Blanc, SM UC-69
- 7 Dec: CGS Simcoe
- 8 Dec: USS Rush
- 9 Dec: SM UB-18
- 10 Dec: SM UB-75, SMS Wien
- 12 Dec: USS Elizabeth, HMS Partridge, HMS Wolverine, Florida
- 13 Dec: SM U-75, HMS Stephen Furness
- 14 Dec: Châteaurenault, SM UC-38
- 17 Dec: USS F-1
- 18 Dec: Mariposa
- 19 Dec: SM UB-56
- 24 Dec: HMS Penshurst
- 25 Dec: Ajax, Espagne, SM U-87
- 30 Dec: HMT Aragon, HMS Attack
- 31 Dec: USS Fli-Hawk, Vigrid, HMS Osmanieh
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