Enigmatic tunnels in USA [igeoNews]
Channel: IgeoNews
Date: 27/02/2014

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For the construction of the tunnels network extending in the United State underground have  used of atomic tunneling machine.These tunneling machine allow to excavate much faster and with a lower cost, due to the enormous amounts of heat (1300 -- 1700 °F) that allow to melt the rock.The distribution network of tunnels extending underground U.S.A  coincides with high topographic areas.The underground bases are provided with a large amplitude and even of multiple levels


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