+ - Tunnel boring machine drills hole under Niagara Fa->
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abhatt
abhatt writes "From the article:
The world's largest tunnel boring machine finished drilling a 10.2-kilometer (6.3-mile) long and 14.4-meter (47.2-feet) high tunnel under the Niagara Falls on Friday.
The 4,000-ton machine, known as Big Becky, had been drilling the tunnel under the world famous waterfalls since 2006."
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The world's largest tunnel boring machine finished drilling a 10.2-kilometer (6.3-mile) long and 14.4-meter (47.2-feet) high tunnel under the Niagara Falls on Friday.
The 4,000-ton machine, known as Big Becky, had been drilling the tunnel under the world famous waterfalls since 2006."
Link to Original Source
Tunnel boring machine drills hole under Niagara Fa More Login
Tunnel boring machine drills hole under Niagara Fa