Photo: "Mud Barges"

The Mare Island Naval Shipyard was the first US naval base on the Pacific Ocean. The land was purchased in the 1850's and shipbuilding began immediately. During the years of operation the shipyard constructed 89 vessels and WWI, Mare Island was a major player in the construction of ships. To this day, they hold the record for the quickest construction of a destroyer (built in just under 18 days).