MA
The 8.8-mile fourth rail tunnel under the Hudson River will require the removal of 2 million cubic yards of rock and soil – roughly a third as much as the Hoover Dam – and will take eight years to build.
Creeping closer inch by inch, 900 feet above the mighty Colorado River , the two sides of a $160 million bridge at the Hoover Dam slowly take shape. ...
Sat, Dec 26 | from Examiner.com