What's inside the hidden tunnel of Calif.'s Bay Bridge

02/28/2013 | KPIX-TV (San Francisco)

The San Francisco-Oakland Bay Bridge in California features a tunnel beneath the roadway, and the 1.7-mile corridor houses a network of seismic fail-safes along with a power substation and lines for water and sewage. "There's a lot of engineering that went into this bridge that people haven’t seen and won't see," said Andrew Gordon, a Bay Bridge spokesman.

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KPIX-TV (San Francisco)

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