This is a drone video from contributor and pilot 400ft of Treasure Island, an artificial island in San Francisco Bay. The island was built in the 1930's for the World's Fair. It was originally planned to be the site of a second San Francisco airport, but when World War II started it was taken over by the US military. Following base closure in the late 1990's the island has been undergoing a process of environmental remediation and redevelopment. The island divides the San Francisco Oakland Bay Bridge into its eastern and western halves.