Russians find 'underground city' of war era on Etorofu island : The Asahi Shimbun
A Russian team discovered a sprawling bunker complex apparently built by imperial Japanese forces on
Japan General Nizhegorodskaya Oblast Mount Iodake Kudryavyi Seseki Onsen Goryachie Klyuchi Bettobu Reidovo L Igor Samarin
Source: asahi.com