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

Vocativ
Vocativ
  • 7 years ago
by Andrew CaringiBertha, 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 to the other side on Tuesday, April 4. 
The post 360° View: Inside The World’s Largest Tunnel Boring Machine appeared first on Vocativ.

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