https://www.milsurps.com/images/impo...apan4611-1.jpg
SCUTTLED JAPANESE AIRCRAFT CARRIER in Tokyo Bay (top); submarines tied up at Maizuru Naval Base (bottom). The submarine nearest the dock is a German U-boat which had been given the Japanese for training purposes.
https://www.milsurps.com/images/impo...apan4612-1.jpg