The San Francisco Bay Naval Shipyard was a short-lived shipyard formed in 1965 as the combination of the San Francisco Naval Shipyard (aka Hunters Point) and the Mare Island Naval Shipyard. The combined yards were the largest naval shipyard in the world, but the desired cost savings did not materialize, and the two yards reverted to separate existences in February 1970. The shipyard was used for radioactive testing when the United States was testing the atomic bomb. The site has since been contaminated. Now the Hunters Point Naval Shipyard is a Superfund site, as designated by the Environmental Protection Agency (EPA). It is the Navy's job to clean up the site to "reasonable" levels to those who live adjacent to the shipyard.