Good Morning fro the Bilges:
Ref HPA. You describe it, but not all. What's missing? The Salvage Air connections either side of the CT where 3000# air can be provided by a surface vessel to the boat. All the salvage air connections had a sort-of, 'Braille," welded on to them so that the diver could identify them them in the dark or mud. Next question COB, oh yeah, here's your coffee and Krispy Kreme!
Cheers, Senior Dink, Hairball.