Submarine No.71
Submarine No.71 was an experimental high-speed submarine built for the Imperial Japanese Navy during the 1930s. Wikipedia
Builder: Kure Naval Arsenal
Launched: August 1938
Construction started: December 1937
Installed power: 1,200 bhp (890 kW) (diesel); 1,800 hp (1,300 kW) (electric motor)
Speed: 13.25 knots (24.54 km/h; 15.25 mph) surfaced; 21.25 knots (39.36 km/h; 24.45 mph) submerged