Sergij
| Name | Sergij |
| Type | Auxiliary motor |
| GRT | 97 tons |
| Country |  Russian |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Auxiliary motor Sergij
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 May 1918 | UB 42 (Erich von Rohrscheidt) | prize | off Novorossik | 2 76mm guns, ammunition, rifles | |||
| Taken as a prize. | ||||||||
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