Spiral
| Name | Spiral |
| Type | Steamer |
| GRT | 1,342 tons |
| Country |  British |
| Built | 1906 |
| Builder | Nylands Verksted, Christiania |
| Operator | Minnie SS. Co., Ltd. (E. A. Caspar, Edgar & Co.), West Hartlepool |
| History |
U-boat attacks on Steamer Spiral
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Aug 1916 | UB 18 (Otto Steinbrinck) | Sunk | 40 miles WSW of St Catherine’s Point | Tyne - Bordeaux | coal | 0 | |
| Or late on August 4. | ||||||||
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