KGO ABC7 News 400PM May 18, 2015
Beneath your feet. If there is an earthquake, i would want to be here. Inside San Franciscos new subway tunnel in 20 years. Youre looking at what will eventually extend the mtas tline by 1. 8 miles and hopefully easing traffic above and a walkthrough by San Francisco mayor. We are well on our way to opening this city up in 2019 and really having a solution a concrete solution to the congestion that we already see in the city. Reporter the concrete down here is the most fascinating. Its roughly 11 inches thick and 18 feet in diameter on the inside, not one piece, but 1,750 rings as they call th...