Matsushiro Underground Tunnel (Zōzan) 松代大本営地下壕（象山地下壕）

Up to ten thousand workers a day dug 10 km of tunnels, and stopped at 75%.

A complex of tunnels dug in secret between November 1944 and August 1945, when the Imperial General Staff prepared a shelter there to move the headquarters and the imperial family in the event of an invasion of Japan: three networks of tunnels totalling about 10 kilometres. About 7,000 Korean forced labourers and 3,000 Japanese worked there, up to 10,000 people a day in April 1945; work stopped, 75% complete, with the announcement of the surrender on 15 August. Since 1990 about 500 metres of the Zōzan tunnel have been open to the public; today the complex also partly houses a seismic observatory.

Nagano

[object Object], Old station, [object Object]

https://theanimetrip.com/luoghi/tunnel-sotterraneo-di-matsushiro

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