RHNS Protefs
The Protefs class (referred to as the Proteus class in some sources) was a group of submarines built for the Hellenic Navy in the late 1920s. The boats were built to a Loire-Simonot design in France and were larger than the preceding Katsonis class built by a different French company.
Four boats were built, all were named after sea gods from Greek mythology.
Protefs (Y3) Launched October 1927, sunk 19 December 1940, rammed by Italian torpedo boat Antares of Valona, Albania
Nirefs (Y4) Launched December 1927, Decommissioned 1945
Triton (Y5) Launched April 1928, sunk 16 November 1942 by German patrol boat UJ2102 (ex Greek yacht Brigitta) near Evia island, Aegean sea.
Glafkos (Y6) Launched 1928, Lost 4 April 1942 at Malta Harbour during a German Air raid.
General characteristics
Displacement: surfaced: 750 tons; submerged: 960 tons
Length: 68.6 m
Beam: 5.73 m
Draft: 4.18 m
Propulsion: two-shaft Sulzer diesel engines;two electric engine motors;1420bhp, 1,200 shp
Speed: surfaced: 14 kn/submerged: 9.5 kn
Range: 3,500 nmi surfaced 10 kn / 100 nmi submerged 5 kn
Test depth: 80 m
Complement:41 men
Armament:
6 × 21-inch (533 mm) internal bow T/T,
2 × 21-inch (533 mm) Internal stern T/T;
1 × 100 mm gun, 1 x 13,2 mm MG