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A worker near the massive drill nicknamed Harriet after it broke through on Watson Island on May 6, 2013 in Miami, Florida, completing the second leg of the 13 month-old, billion dollar Miami Tunnel project.

A worker near the massive drill nicknamed Harriet after it broke through on Watson Island on May 6, 2013 in Miami, Florida, completing the second leg of the 13 month-old, billion dollar Miami Tunnel project.

Step inside the world's longest railway tunnel The Gotthard Base Tunnel - Some very large drills were used for the £8.41bn project Credit: AFP

Step inside the world's longest railway tunnel The Gotthard Base Tunnel - Some very large drills were used for the £8.41bn project Credit: AFP

The Niagara falls tailrace tunnels...Journey Behind the Falls is not to be missed!

The Niagara falls tailrace tunnels...Journey Behind the Falls is not to be missed!

Tasked with tunneling under California’s Santa Ana River riverbed, D.J. Scheffler crew members drilled two shafts using continuous flight auger (CFA) secant wall technology. This effort was part of the Santa Ana River Interceptor Relocation Project spearheaded by the Metropolitan Water District of Southern California.

Tasked with tunneling under California’s Santa Ana River riverbed, D.J. Scheffler crew members drilled two shafts using continuous flight auger (CFA) secant wall technology. This effort was part of the Santa Ana River Interceptor Relocation Project spearheaded by the Metropolitan Water District of Southern California.

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