JS Mochisio (SS-600) is the eleventh boat of the Oyashio-class submarines.

[1] Mochisio was laid down at Kawasaki Heavy Industries Kobe Shipyard on 23 February 2004 and launched on 6 November 2006.

[2][3] The vessel departed Wu on 31 May 2010 to participate in RIMPAC 2010 and arrived at Pearl Harbor, Hawaii on 21 June.

[4][5] On 12 October 2011, she set sail for Hawaii via Guam for US dispatch training.

The training was conducted from late October to mid-December, and returned to the port on 21 January 2012.