War goes underground: Japan’s former Naval headquarters in Okinawa

Particularly after World War I (perhaps earlier and continuing even now), it was not unusual for military forces to build underground facilities.  The principal reasons were doubtless concealment--their presence was harder to detect--and protection--they were harder to be destroyed by the enemy if they were detected.  Examples include the facilities of France's Maginot Line, Singapore's … Continue reading War goes underground: Japan’s former Naval headquarters in Okinawa