Alert
| Name | Alert |
| Type | Lighthouse tender |
| GRT | 777 tons |
| Country |  British |
| Built | 1911 |
| Builder | Ramage & Ferguson, Ltd., Leith |
| Operator | Corporation of the Trinity House, London |
| History |
U-boat attacks on Lighthouse tender Alert
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 15 Apr 1917 | Sunk | Mined 3.5 miles ESE of No.7 Ruytingen Buoy, Dover Strait | 51° 05'N, 1° 56'E | London - Dover | 11 |
Position of attack on Alert
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