HMT Longset
| Name | HMT Longset |
| Type | Navy Trawler
|
| GRT | 275 tons |
| Country |  British |
| Built | 1914
|
| Builder | Cochrane & Sons, Ltd., Selby
|
| Operator | Royal Navy
|
| History | Peace-time operator: Lindsey Steam Fishing Co. Ltd., Grimsby
|
U-boat attacks on Navy Trawler Longset
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 6 Feb 1917 | UC 46 (Friedrich Moecke) | Sunk | Mined off Nell’s Point, Barry Island 2 miles SE of Wreck Buoy near the Breaksea LV
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| 8
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