A Japanese research team has discovered 3 World War Two-era submarines, including a German-made U-boat, in a bay opening towards the Sea of Japan.
Last month, a team led by the Kyushu Institute of Technology surveyed the seabed of Wakasa Bay, some 20 kilometers off Maizuru City, Kyoto Prefecture, using an underwater drone.
The discovery of the 3 Imperial Japanese Navy submarines at a depth of about 90 meters matched US military records and other accounts.
One of the subs has been confirmed as a U-boat renamed "Ro-500" by the Imperial Japanese Navy.
The U-boat was handed over to Japan by Nazi Germany in 1943. It arrived at Kure City, Hiroshima Prefecture in western Japan after a voyage of about 90 days.
The Ro-500 was used mainly for training. It was deliberately sunk by the US military in 1946.
The research team says its 70-meter hull remains largely intact, with little visible damage.
The other 2 subs have been confirmed as the Ro-68 and the I-121.
Team leader Tamaki Ura says the U-boat will provide important clues to understanding wartime technological cooperation between Japan and Germany.