Tiro
| Name | Tiro |
| Type | Steamer |
| GRT | 1,442 tons |
| Country |  Norwegian |
| Built | 1910 |
| Builder | Sunderland SB. Co., Ltd., Sunderland |
| Operator | D/S A/S Gonvik (Christensen & Paulsen), Sandefjord |
| History |
U-boat attacks on Steamer Tiro
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Dec 1917 | UB 57 (Otto Steinbrinck) | Sunk | Torpedoed and sunk 7 miles NW x W1/2W of Lizard | 49° 56'N, 5° 23'W | Barry - Rouen | coal | 8 |
Position of attack on Tiro
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