Aerial video of Seattle's giant tunnel-boring machine, Bertha, breaking through to complete its tunnel

A drone’s view: The ULTIMATE look at Bertha’s breakthrough
On April 4, 2017, one of the world’s largest tunneling machines chewed through more than 1,000 tons of concrete and fiberglass to end a 1.7 mile journey underneath downtown Seattle. With a drone’s eye view, this video shows the raw power of Bertha’s breakthrough - start to finish.

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