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Photo Journal: Drilling Tokyo's depths

(Mainichi)

A shield tunneling machine, which will be used to dig underground tunnels for the outer-Tokyo beltway connecting the Kanetsu and Tomei expressways, is seen at right during its unveiling at a construction site in Tokyo's Setagaya Ward on Feb. 19, 2017. A hole created by the machine is seen at left. The expressway plan calls for the creation of two three-lane tunnels about 40 meters underground extending some 16 kilometers between two junctions in Nerima and Setagaya wards. The 16-meter-diameter cylindrical machine -- the largest of its kind in Japan, according to the Ministry of Land, Infrastructure, Transport and Tourism -- can drill approximately 500 meters a month while lining the tunnel wall with concrete. (Mainichi)

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