Interesting! "A recent discovery of an underground tunnel in China may prove that the Imperial Japanese Army and Manchukuo were building a massive fortress complex in the closing days of World War II to fight to the end. The remains of a structure under construction have been discovered by a Japanese researcher at a site in northeastern China known as Manchuria at the time where Manchukuo (1932-1945), the Japanese puppet state, existed. They are believed to be part of the covert project, known as Hikari construction. The discovery was made by Hisaya Okazaki, representative of the Okayama-based nonprofit Japanese Center of Researching Kotou Fortress, when he visited China last spring at the invitation of Chinese researchers. Okazaki, 56, who studies military facilities that the Imperial Japanese Army constructed on mainland China before and during the war, found the tunnel in a mountainous area of Tonghua in Jilin province. The site, in the area called Dongbiandao during the war, is about 50 kilometers from the border with what is now North Korea. “If our research progresses, it could shine light on many aspects of the covert operation that had been under way just before Japan’s surrender after it has remained a mystery for decades,” Okazaki said. The tunnel, which has withstood collapse, measures several tens of meters long. It branches off at some locations, apparently to secure more floor space, and concrete was used at some areas. There were traces of drilling involving dynamite at one end of the tunnel. There also were remains of an entrance for supplies and a water storage facility near the tunnel." Tunnel remains in China show Japan’s intent to fight to the end:The Asahi Shimbun