To dig a tunnel under the ocean floor, engineers can use massive tunnel boring machines, or TBMs, similar to ones used in the Swiss Alps.
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Mega Engineering: Tunnel Boring Machines
To dig a tunnel under the ocean floor, engineers can use massive tunnel boring machines, or TBMs, similar to ones used in the Swiss Alps.
Added: Jun 4, 2009
Views: 23691 Views
Runtime: 02:43
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