OAKLAND, Calif. (KTVU) - In this week's Flashback Friday we are celebrating the 80th anniversary of the opening of the Bay Bridge.
To mark the occasion the California State archives released an online exhibit of the construction of the bridge from 1933 to 1936.
The design and construction of the Bay Bridge was one of the biggest construction challenges of the 20th century because it needed to span more than five miles and withstand, strong tides, wind and of course earthquakes.
Photos show the excavation of the 1,700 foot tunnel through Yerba Buena Island to connect the eastern and western spans of the bridge.
Temporary railroads had to be built to get rid of the debris and clear the way for crews.
In total - work on the Bay Bridge took a little over three years, but came in six months ahead of schedule and under budget.