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Umihotaru: Cutter Face monument

This is the cutter face of one of the slurry shield machine used to drill the undersea tunnel for the Tokyo-Wan Aqua-Line Highway which connects the city of Kawasaki in Kanagawa Prefecture with the city of Kisarazu in Chiba Prefecture. It is located in Umihotaru artificial island at the center of Tokyo Bay.

The 14.14-meters diameter of the shield machine is the world’s largest. The drilling operation was carried out by rotating the cutter face during 24 months between August 1994 and August 1996, when the tunnel excavation was completed.

Junko Nagata ©Japanbyweb.com

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