DSRV-2 Avalon, Deep-submergence rescue vehicle at Maritime Museum in Morro Bay, California, US.

The DSRV-2 Avalon is a Mystic-class deep-submergence rescue vehicle, 50 feet (15 m) long, 8 feet (2.4 m) in diameter and weighing 37 tons, displayed on land at the Morro Bay Maritime Museum in Morro Bay, California. It was built to be air transportable and could carry 24 passengers besides its crew. Battery-powered, it would have had to pause mid-mission to recharge.

Avalon was acquired by the U.S. Navy in response to the 1963 loss of the USS Thresher, so that trapped submarine crews could be reached. The Mystic-class vehicle was launched in 1971 and rated to dive to 5,000 feet (1,500 m). It was stationed at North Island Naval Station in San Diego, never carried out an actual rescue, and was decommissioned in 2000.

Avalon is named after the island of Arthurian legend, a nod to the vessel's role of bringing crews back from the deep. Its fictional counterpart appears in Tom Clancy's 1984 novel The Hunt for Red October and the 1990 film adaptation, where the rescue sub is central to the plot.

The Avalon sits on dry land at the Morro Bay Maritime Museum, so visitors walk around the hull rather than boarding it. Its 50-foot (15 m) length and 8-foot (2.4 m) beam are easiest to judge from the side, where the pressure hull and sail are visible. Check the museum's opening days before travelling, since the vessel is an outdoor exhibit.

Avalon appears in Tom Clancy's 1984 novel The Hunt for Red October and its 1990 film adaptation. The real vessel never performed a rescue; it was decommissioned in 2000 and donated to the Morro Bay Maritime Museum, where it is displayed ashore.