Although the article clearly spells it "Souryu", I'll use "Soryu" since I've seen that Romanji used more often in other articles. And the latter name should not be confused with the IJN carrier from World War II.
JanesQuote:
Kawasaki delivers Japan's eighth Souryu-class submarine
Ridzwan Rahmat, Singapore - IHS Jane's Defence Weekly
14 March 2017
Key Points
Japan has taken delivery of its eighth Souryu-class submarine
Delivery increases Japan's fleet of AIP-capable submarines, which feature better underwater endurance
The Japan Maritime Self-Defense Force (JMSDF) has taken delivery of its eighth Souryu-class diesel-electric submarine (SSK) from Kawasaki Heavy Industries (KHI).
The 4,100 tonne (when submerged) vessel, which has been named Sekiryu with pennant number 508, was handed over on 13 March in a ceremony held at KHI's facilities in Kobe.
The SSK is the fourth Souryu-class boat to be built by KHI, and was first laid down in March 2013. The boat was subsequently launched by the shipbuilder in November 2015.
(...SNIPPED)