DSRV-2 Avalon was a Mystic-class deep-submergence rescue vehicle rated to dive up to 5,000 feet (1,500 m) to rescue submarine crews trapped deep under the sea.

The sub is 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.

Avalon is battery-powered, and would have needed to pause midway through a rescue mission to recharge its batteries.

[1] Avalon was stationed at North Island Naval Station in San Diego and was never required to conduct an actual rescue operation.

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