[2] The Yūshio-class was an enlarged derivative of the preceding Uzushio class, with improved electronics and capable of diving to greater depths.

[3] Six 21-inch (533 mm) torpedo tubes were fitted amidships, while Nadashio was the first of her class to be able to launch Sub-Harpoon anti-ship missiles.

[3] Nadashio was ordered under the Fiscal Year 1980 shipbuilding programme, and was laid down at Mitsubishi Heavy Industries' Kobe shipyard on 16 April 1981.

[3] On 23 July 1988 the submarine collided with and sank the sports fishing boat Fuji Maru No 1 causing the death of 30 people and injuring a further 17.

Both the captain of Nadashio and the skipper of Fuji Maru No 1 were given suspended prison sentences because of the collision, while the Director General of the Japanese Defense Agency resigned as a result of the accident.