Sieka
| Name | Sieka |
| Type | Sailing vessel
|
| GRT | 119 tons |
| Country |  Dutch |
| Built | 1915
|
| Builder | W. Mulder, Stadskanaal
|
| Operator | Willem Mulder, Stadskanaal
|
| History | Steel-hulled two-masted sailing vessel
|
U-boat attacks on Sailing vessel Sieka
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 18 Dec 1916 | U 71 (Hugo Schmidt) | Sunk | Stopped and sunk in the North Sea
| 56° 43'N, 4° 35'E
| Christiana - West-Hartlepool
| pitprops
| 0
|
| Crew taken on board and landed at Wilhelmshaven
|
Position of attack on Sieka
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