Back to your example that atmospheric pressure is double at 34 feet than at the surface. Don't you mean the pressure exerted on a human in 34 feet of water is double that of the air pressure at the surface?
Yes in terms of the psi exerted, 14.7 psi at the surface, 29.4 psi at a depth of 34 ft, with an increase of 14.7 psi every 33-34 ft you go down.
