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- Space.com: NASA's 'Snakebots' Slither to Life
Underwater tunnels are so commonplace that we rarely think of the great dangers -- and extreme construction techniques -- these modern wonders require. With the opening of the Marmaray Tunnel in October 2013, it's time to take a second look.
Brilliant engineering goes into creating a sturdy, reliable (and sometimes beautiful) bridge. Learn about these fascinating structures in these videos.