I should've remembered the density difference... According to omniscient Wikipedia, diesel is 83% the density of water, so the 33 feet that water can be lifted

I should've remembered the density difference... According to omniscient Wikipedia, diesel is 83% the density of water, so the 33 feet that water can be lifted via suction becomes ~38'. The Trieste used the buoyancy of (incompressible) gasoline to enable a return trip from the bottom of the Mariana Trench. Strong work lifting all that fuel!