Utilization of the Deep Underground Space in Tokyo

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In 2001, the law concerning Deep Subterranean Utilization went into effect in Japan. The law states that the use of space at a certain depth underground does not violate the right of the private above-land ownership. In order to provide for urban disaster mitigation in Tokyo and lessen the environmental burden, technological planning should be applied to Tokyo. This researcher focuses on deep underground space as the last precious unused space of the mega city, Tokyo. We present an effective way of developing a deep underground space network in a closed-off section of Tokyo Bay to promote urban renewal in Tokyo.Our research group has been working on projects related to the utilization of deep underground spaces. We have proposed several projects since the 1970s and examined their effectiveness. An outline of the latest project that aims at effective utilization of deep underground is presenter in this research. The way effective implementation of the project can be achieved is also discussed. These projects are major public- works and need to receive higher budget priority Accordingly, it is very important to work out new public- works schemes. This researcher also focuses on the results of feasibility studies and shows how the project can be realized by integrating urban disaster prevention with urban environment improvement.