Technical information
| Type | Submarine |
| Displacement | 750 BRT |
| Length | 68.6m |
| Complement | 41 men |
| Armament | 1 3.9" gun 1 40mm 8 21" torpedo tubes (6 bow, 2 stern) |
| Max speed | 14 / 9.5 knots (surfaced/submerged) |
| Engines | 1420 / 1200 HP |
| Power | Diesel / electric, 2 shafts (surfaced/submerged) |
| Notes on class |
All ships of the Proteus class
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| RHS Glavkos (Y 6) | Lost on 4 Apr 1942 | |
| RHS Nereus (Y 4) | ||
| RHS Proteus (Y 3) | Lost on 29 Dec 1940 | |
| RHS Triton (Y 5) | Lost on 16 Nov 1942 | |
| ||
Royal Hellenic Navy (more on See all Submarine classes.