www.mlit.go.jp/toshi/daisei/crd_daisei_tk_000014.html

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大深度地下利用：大深度地下使用法の使用認可を受けた事業 - 国土交通省

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https://www.mlit.go.jp/toshi/daisei/crd_daisei_tk_000014.html

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This page introduces four major projects that have received approval under the Special Measures Law for Public Use of Deep Underground Space. The Kobe Large-capacity Water Transmission Pipe Project (2007) built earthquake-resistant pipelines for disaster mitigation. The Tokyo Outer Ring Road (2014) aims to alleviate traffic congestion in the metropolitan area. The Chuo Shinkansen (2018) connects Tokyo and Nagoya using magnetic levitation technology, linking three major metropolitan areas. The Neyagawa Underground River Project (2019) reduces flood damage through an underground river system. All projects applied the deep underground use law, achieving construction period reduction and economic benefits.