Sibens
| Name | Sibens |
| Type | Sailing vessel |
| GRT | 323 tons |
| Country |  Russian |
| Built | 1910 |
| Builder | G. Hahnsien, Uppesgriew |
| Operator | K. Puhling & L. Tramdent, Talsen |
| History |
U-boat attacks on Sailing vessel Sibens
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Jun 1917 | UC 53 (Kurt Albrecht) | Sunk | Stopped and scuttled off the Santa Maria LH, Portugal | 36° 52'N, 8° 08'W | Cadiz - Chatham, New Brunswick | salt |
Position of attack on Sibens
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