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soil, the result of ancient water wells, old riverbeds, and illegal underground sewage connections. and certain portions of shallow tunnel passed beneath weak structures, such as ancient churches and monuments, at risk of collapsing. the project team used three tunneling methods, including tunnel-boring
soil, the result of ancient water wells, old riverbeds, and illegal underground sewage connections. and certain portions of shallow tunnel passed beneath weak structures, such as ancient churches and monuments, at risk of collapsing. the project team used three tunneling methods, including tunnel-boring...
https://www.bechtel.com/projects/athens-metro/