JS Kokuryū (SS-506) is the sixth boat of Sōryū-class submarines.

[2] Kokuryū was laid down at Kawasaki Heavy Industries Kobe Shipyard on January 21, 2011, as the 2010 plan 2900-ton submarine No.

8121 based on the medium-term defense capability development plan.

She's commissioned on 9 March 2015 and deployed to Yokosuka.

[3] Media related to JS Kokuryū (SS-506) at Wikimedia Commons