Suspected Chinese submarine detected near Amami | NHK WORLD-JAPAN News

https://www3.nhk.or.jp/nhkworld/en/news/20210912_13/

… Japan’s Maritime Self-Defense Force detected a foreign submarine
navigating in the contiguous zone, just outside the country’s territorial waters east of Amami-Oshima Island in Kagoshima Prefecture
on Friday.

The SDF’s destroyer and patrol aircraft followed the submarine, which was underwater and heading northwest…