Here's something I found.........minus the "2 yellow Oxygen tanks comment, it at least makes sense, as in ascending a line/passing out goes......
.....In early October, he and a few buddies drove to Watch Hill and successfully dove, exploring the Metis. Three weeks later, he returned with some of the same friends for another dive. While diving, Joseph Pasquale decided to surface before his two companions. When the two men got to the surface, Joseph Pasquale wasn't there.
Tragedy at that stretch of water dates back to the night of Aug. 30, 1872. Bound for Providence, the Metis, which had 104 passengers and 45 crewmembers, was rammed by a schooner, according to the Coast Guard. Boats from Stonington rushed toward the wreckage, but only 33 people survived.
With the advent of scuba gear, the remains of the Metis have become a popular spot for experienced divers to explore. Ten to 15 times a year, Frank Civitello and Patrick Casey dive to the Metis, collecting bottles, luggage tags and other artifacts from the wreck.
Wednesday, the pair trudged on the sea floor, their flashlights piercing the darkness. Just past the Metis' 22-foot-high rusting engine, their beams revealed something.
Suspended upside down, it was a diver somehow anchored to the seafloor. His dry suit was inflated and his two yellow oxygen tanks were still strapped to his back, Civitello said. The diver had taken off his weight belt, but it seemed to be tangled, snagged in his equipment.......