The next place on the trip was Matsuhiro, the home of the underground WWII Imperial headquarters. Matsuhiro is a valley surrounded by very steep mountains with no landmarks easily seen from the air. This made it a perfect site for the construction of the emergency headquarters for the Imperial family, the Army headquarters, Japan Brocasting Station, the military communtications headquarters, among others. The tunnels themselves are interconnected with mulitiple entrances throughout the valley. They were never finished due to the bombing of Hiroshima and Nagasaki, and Japan's surrender.