An article in the Japan Times Online starts so...
Seven riddles suggest a secret city beneath Tokyo
By ANGELA JEFFS
During the Gulf War in 1991, Shun Akiba was one of only two foreign journalists reporting from Baghdad, along with Peter Arnett of CNN. With such experience and expertise, it would be reasonable to imagine him in great demand right now. Wrong.
Shun Akiba, a former high-level foreign reporter, has identified hundreds of kilometers of Tokyo tunnels whose purpose is unknown and whose very existence is denied.
Shun is on some kind of invisible blacklist. His book "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. Yet Shun has found it impossible to get the media to take serious note, write reviews or offer interviews.
This is very strange because 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. "Why am I ignored? Can I be on to something, and there is a conspiracy to silence me? I believe so."
Makes for a nice movie plot, don'cha think? Who knows what secrets lie underneath Manila's own streets.