The Science Behind Tunnel Boring Machines

Historically, tunnel boring machines (TBMs) are named for women, a tradition originating with miners praying to their patron saint, Barbara, for protection from cave-ins, suffocation and other dangers associated with digging underground. Naming a boring machine in advance of a project is thought to bring good luck, and thus we have Seattle's Bertha, the Chesapeake Bay's Chessie and New York's Nora, created by the Robbins Company for work on the Delaware Aqueduct....

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