Background
In 1938 the Imperial Japanese Navy constructed an experimental high-speed submarine for evaluation purposes, which was designated Vessel Number 71 (第71号艦) for security purposes. Based on previous experience with high-speed, short-range midget submarines, Number 71 displaced only 230 tons surfaced with a length of 140 ft (43 m). She could attain a submerged speed of over 21 kn (39 km/h; 24 mph), making her the fastest submarine of her day. The results gained from experiments with Number 71 formed the basis for the I-201 class submarines.
Read more about this topic: I-201 Class Submarine
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