Underground 'Earth corridor' museum in central Japan to close at end of March March 9, 2021 (Mainichi Japan) A skeletal model of Diplodocus is seen on display in an underground trench filled with the roar of dinosaurs in Mizunami, Gifu Prefecture, on Feb. 20, 2021. (Mainichi/Koji Hyodo) MIZUNAMI, Gifu -- The "Earth Corridor" museum in this central Japan city, established in 1993 using the remains of an underground factory dug during the Pacific War, will close at the end of March due to deterioration, and local people who regret the end of an era are visiting the facility one after anothe...