Souma
| Name | Souma |
| Type | Steamer |
| GRT | 2,200 tons |
| Country |  Russian |
| Built | 1907 |
| Builder | Forges & Chant. de la Méditerranée, Le Havre |
| Operator | Archangel-Mourman Steam Navigation Co., Arkhangel’sk |
| History |
U-boat attacks on Steamer Souma
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 30 Jul 1917 | U 94 (Alfred Saalwächter) | Sunk | NNE of Muckle Flugga, Shetlands | 61.34N, 00.55W | Arkhangel’sk - Lerwick |
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