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The Type B1 submarine (巡潜乙型潜水艦, Junsen Otsu-gata sensuikan, lit. "Cruiser submarine type B"), also called I-15-class submarine (伊一五型潜水艦, I-jū-go-gata sensuikan) was the first group of boats of the Type B cruiser submarines built for the Imperial Japanese Navy (IJN) during the 1940s. In total 20 were built, starting with I-15, which gave the series their alternative name.