Success
| Name | Success |
| Type | Fishing vessel (smack) |
| GRT | 54 tons |
| Country |  British |
| Built | 1903 |
| Builder | Kitto & Son, Porthleven |
| Operator | Joseph John Colby & Sarah Ann Colby, Lowestoft |
| History | Port registration: LT 1007 |
U-boat attacks on Fishing vessel (smack) Success
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 Jul 1918 | UB 40 (Hans Joachim Emsmann) | Sunk | Stopped and scuttled 7 miles NExE of the Haisborough LV | 0 |
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