I disagree- I've done it from 30' with everything on and it was only a little painful, jumped from the 15' range many times with no problems.muddiver:Recreational diver boats are about 2' to 4' above the surface of the water and you will not lose your mask and fins jumping from that height.
A SAR bird (helicopter) will hover about 15' to 20' above the water so as not to wash the survivors and the rescue swimmer away with the rotor wash. You can't jump from that high with you mask and fins on without losing them and hurting yourself. You fins hitting the water will probably breack you ankles above about 10'.