San Nazario
| Name | San Nazario |
| Type | Tanker |
| GRT | 10,064 tons (one of the largest ships hit) |
| Country |  British |
| Built | 1914 |
| Builder | W. Doxford & Sons, Ltd., Sunderland |
| Operator | Eagle Oil Transport Co., Ltd., London |
| History |
U-boat attacks on Tanker San Nazario
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 15 Oct 1917 | U 53 (Hans Rose) | Damaged | Torpedoed SW from the Scilly Islands, reached port. | 48° 24'N, 8° 20'W | Plymouth - Tampico | 0 |
Position of attack on San Nazario
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