Costante
| Name | Costante |
| Type | Steamer |
| GRT | 3,479 tons |
| Country |  Italian |
| Built | 1898 |
| Builder | Palmers’ SB. & Iron Co., Ltd., Newcastle |
| Operator | Dall’Orso & Co., La Spezia |
| History |
U-boat attacks on Steamer Costante
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 Apr 1917 | U 32 (Kurt Hartwig) | Sunk | between Dellys and Bougie | 36° 53'N, 4° 15'E | Bahia Blanca - ? |
Position of attack on Costante
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