We are located in the Dogpatch District of San Francisco, overlooking Pier 70 and the San Francisco Bay. Pier 70 is the oldest working civilian shipyard in the U.S., built in 1850 by Union Iron Works. Since the mid 1800's, Pier 70 has built everything from small wooden fishing boats to major steel fabricated warships. In 1918, one year after the United States entered the First World War, the shipyard constructed 18 submarines, and 66 destroyers. At that time Pier 70 employed 10,000 workers, making it the single largest ship producing complex in the world. During the Second World War, Bethlehem Steel expanded Pier 70 in order to manufacture 52 warships, troop transports, and other war related Vessels. In more recent history, the tubes for Bart that unite the East Bay and San Francisco were built at the shipyard. Pier 70's long history continues, being the largest heavy industrial operation in San Francisco.