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Probable nuclear powered drill used to make underground tunnels and bases. This photo is reported to have been taken at the Dulce area in the New Mexico desert.
Each TBM weighs more than 2 million pounds and stretches 344 feet. The diameter of each tunnel is 21 feet. As the machines were advancing, pre-cast concrete tunnel lining were installed in the tunnels.
The amount of earth excavated from the two tunnels could cover an entire football field from sideline to sideline and end-zone to end-zone 15 stories high.
Eastside construction workers have logged nearly 1.3 million hours with no lost-time injuries, setting a record that has astonished long-time construction safety executives since starting work on the project in July 2004.
“This is an incredible accomplishment and speaks volumes to our commitment in making safety priority number one,” said Metro CEO Roger Snoble.
The Tunnel Boring Machines, nicked-named Lola and Vicki, were custom-built in Germany for Metro by Herrenknecht at a cost of $10 million each. Construction of the Metro Gold Line Eastside Extension is being done by Eastside LRT Constructors, a joint venture of Washington Group International, Obayashi Corporation and Shimmick Construction Company.
Originally posted by ukmicky1980
So, If such a machine was nuclear powered, could it be the same size as the one here, or would it have to be much bigger?