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Japan Maritime Self-defense (JMSDF) publicity original video "Sōryū-class submarine: Dive". The Sōryū-class submarines (16SS) are diesel-electric attack submarines. The JMSDF changed its naming convention with the Sōryū, and submarines will now be named after mythological creatures. Sōryū means blue dragon in Japanese and is named after the World War II aircraft carrier Sōryū, which was sunk during the Battle of Midway. The first boat in the class entered service with the Japan Maritime Self-Def