Italian submarine Otaria (1935)

History
Kingdom of Italy
Name	Otraria
Builder	Cantieri Riuniti dell'Adriatico, Trieste
Launched	20 March 1935
Fate	Discarded, 1 February 1948
General characteristics
Type	Submarine
Displacement	1,071 t (1,054 long tons) (surfaced); 1,326 t (1,305 long tons) (submerged);
Length	73 m (239 ft 6 in)
Beam	7.2 m (23 ft 7 in)
Draft	5.12 m (16 ft 10 in)
Installed power	3,000 kW) (diesels); 1,200 hp (890 kW) (electric motors);
Propulsion	2 shafts; diesel-electric; 2 × diesel engines; 2 × electric motors;
Speed	17 knots (31 km/h; 20 mph) (surfaced); 8 knots (15 km/h; 9.2 mph) (submerged);
Range	9,760 nmi (18,080 km; 11,230 mi) at 8 knots (15 km/h; 9.2 mph) (surfaced); 110 nmi (200 km; 130 mi) at 3 knots (5.6 km/h; 3.5 mph) (submerged);
Test depth	90 m (300 ft)
Crew	58
Armament	2 × single deck guns; 2 × single 13.2 mm (0.52 in) machine guns; 8 × 533 mm (21 in) torpedo tubes (4 bow, 4 stern);

Otraria was one of two Argo-class submarines ordered by the Portuguese government, but taken over and completed for the Regia Marina (Royal Italian Navy) during the 1930s. She played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.

Design and description

The Glauco-class submarines were improved versions of the preceding Squalo class. They displaced 1,071 metric tons (1,054 long tons) surfaced and 1,326 metric tons (1,305 long tons) submerged. The submarines were 73 meters (239 ft 6 in) long, had a beam of 7.2 meters (23 ft 7 in) and a draft of 5.12 meters (16 ft 10 in).^[1] They had an operational diving depth of 90 meters (300 ft).^[2] Their crew numbered 58 officers and enlisted men.^[1]

For surface running, the boats were powered by two 1,500-

propeller shaft. When submerged each propeller was driven by a 600-horsepower (447 kW) electric motor. They could reach 17 knots (31 km/h; 20 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the Glauco class had a range of 9,760 nautical miles (18,080 km; 11,230 mi) at 8 knots (15 km/h; 9.2 mph); submerged, they had a range of 110 nmi (200 km; 130 mi) at 3 knots (5.6 km/h; 3.5 mph).^[2]

The boats were armed with eight internal 53.3-centimeter (21 in)

13.2-millimeter (0.52 in) machine guns.^[1]