Tokyo Kakusareta Chikamono Himitsu (Imperial City Tokyo: Secret of a Hidden Underground Network) is a book that exposes the a network of secret train tunnels under Tokyo. It focuses on the history of subway construction and the inconsistencies between subway maps and reality. Japan Times has an interview with him:

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.

The interview covers how the author is now being blacklisted by the media for his involvement in questioning this phenomenon.
Via Wirefarm
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