This great pictures are shared from wired.com.
Here an excerpt and the link to keep on reading:
After 25 years as a boilermaker, shipfitter and welder, photographer Joseph Blum knows his way around construction sites. His remarkable photographs take us behind-the-scenes on the construction of the new eastern span of San Francisco’s bay bridge, and are on view at the San Francisco Arts Commission gallery through September.
This is no ordinary construction site — the bridge is the largest self-anchored suspension bridge (SAS) in the world, and it connects the East Bay with San Francisco. Footed in mud strata, with giant shock absorbing fuses embedded underneath the roadway, the bridge is designed to be a seismic neutralizer and provide a lifeline into San Francisco for emergency services even when the surrounding area is flattened. It’s also supposed to last for 150 years.