Efstathios
| Name | Efstathios |
| Type | Steamer
|
| GRT | 3,847 tons |
| Country |  Greek |
| Built | 1907
|
| Builder | Northumberland SB. Co., Ltd., Newcastle
|
| Operator | N. E. Ambatielos (Ambatielos Bros.), Argostoli
|
| History |
|
U-boat attacks on Steamer Efstathios
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 27 May 1917 | UC 21 (Reinhold Saltzwedel) | Sunk | 15 miles from Cape Penus
|
| Baltimore - Bordeaux
| aircraft and engines, oil & wire
|
|
| Was carrying 67 airplanes and aircraft engines.
|
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