Seven riddles suggest asecret city beneath Tokyo
Japan Times / Saturday, March 1, 2003
"Teito Tokyo Kakusareta Chikamono Himitsu" ("Imperial City Tokyo: Secret of a Hidden Underground Network"), published by Yosensha in late 2002, is already in its fifth edition.... he has a great story -- evidence of a network of tunnels and possibly an underground city beneath Tokyo that the public is totally unaware of. ....
Sitting on the Ginza subway from Suehirocho to Kanda, he says, you can see many mysterious tunnels leading off from the main track. "No such routes are shown on maps." Traveling from Kasumigaseki to Kokkai-gijidomae, there is a line off to the left that is not shown on any map. Nor is it indicated in subway construction records.
At Tameike-sanno on the Ginza Line, the first basement level is closed off, for official use only. "Go to the toilet on B2 and there is a door to B1, but locked."