DSRV-1Mystic is a Deep Submergence Rescue Vehicle that is rated to dive up to 5000 feet (1500 m). DSRV-1 was built by Lockheed for the U.S. Navy at a construction cost of $41 million and launched 24 January 1970. She was declared fully operational in 1977 and named Mystic.
The submarine, intended to be air transportable, was 50 feet (15 m) long, 8 feet (2.4 m) in diameter, and weighed 37 tons. The sub was capable of descending to 5,000 feet (1,500 m) below the surface and could carry 24 passengers at a time in addition to her crew. The sub was stationed at North Island Naval Station in San Diego and was never required to conduct an actual rescue operation. Last pilot to qualify was STS1(SS/DV) Jason E. Clayton. Mystic was replaced by the SRDRS on September 30, 2008 and began deactivation on October 1, 2008. The submarine may be donated to the Naval Undersea Museum.