Abstract: An ascent/decompression device for use in diving with an inflatable lift bag, includes a pack for securing the ascent/decompression device on a diving harness worn by a diver; a reel mounted for rotation to the pack and having a decompression line wound thereabout, the decompression line being connected to the lift bag; a cable having a first end and a second loop end; a snap shackle connected with the first end and releasably holding the loop end to secure the cable about a ship wreck, the snap shackle including a main section having an open side, a closure lever pivotally connected to the main section for movement between closed and open positions, and a spring-biased pin for releasably locking the closure lever in the closed position; a first release clip for receiving the decompression line to limit a rate of ascent of the lift bag connected to the decompression line, and being connected to the cable; a second release clip secured to the pack for engaging with the spring-biased pin of the snap shackle; an