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360° View: Inside The World’s Largest Tunnel Boring Machine

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360° View: Inside The World’s Largest Tunnel Boring Machine

V
Vocativ

3 Views • Apr 06, 2017

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<b> by Andrew Caringi</b>

Bertha, the world’s largest tunnel boring machine, has spent nearly four years digging a new highway under Seattle. The machine measures 57 feet in diameter and drills about 50 feet per day. The underground highway it’s helping create will be used by over 100,000 cars per day. Bertha broke through</a> to the other side on Tuesday, April 4.

 


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