Japan's Underground Naval Dugouts - A Silent History Teller -- Text includes translated remarks

KANAGAWA, JAPAN - JUN. 23: Thick concrete walls, coded wire communications room, and air raid evacuation room among other facilities at a huge complex of underground dugouts are eloquently telling the history of the war - but silently. The Imperial Japanese Navy's secret commanding headquarters at the final days of the Second World War - with its deepest point at 30 meters underground - is located beneath Hiyoshi Campus of prestigious Keio University in Yokohama, south of Tokyo. The Imperial Navy in 1944 hired the ground, along with the university's boarding houses, and build the facility to prepare for what it thought to be imminent - the battle on mainland Japan as American troops quickly approached Japan thoughout the Pacific fronts. The Navy ordered from here the world's largest battleship Yamato to join war off Okinawa but was powerlessly sanken en route by U.S. warplanes which then already dominated Pacific airspaces. Japan surrendered and the war ended in summer 1945. 00:10-01:18 "We are now at the heart of underground Command of the Combined Fleet. This space was the operation room of the communications unit with 30 shortwave radios alongside the both walls on 24-hour full operation in three or four shifts. So there used to be 90 or 100 soldiers actually on duty every day. The space across was for the decoding unit with the same manpower and the same facilities. Both units are receiving only. They did not transmit in order to avoid being detected by the Allied forces.", 01:19- 01:32 "On the ceiling were many light bulbs and it was bright like daytime, I hear. Although there are now scarcely anything that reminds us of those days.", 02:17-02:36 "These signs and graffiti are not written by soldiers. But they are all postwar writings by boys and girls who sneaked in and “explored” this secret underground world for them. These map sketches are so accurate, though."