It is less important to me how many newtons are required to smash a bone.
So the interesting part is the stretch from 150 to 250 feet.
My guess is that the limit for someone voluntarily performing repeated water dives/jumps from a height of 'x' will show 'x' to be somewhere around 225 feet /- 25 feet.
)@Jerry Schirmer Surface tension is a negligible force, barely able to hold up an insect.
In addition to increasing acceleration distance, the diving position also lines up your body parallel to the direction of motion, decreasing your cross-sectional area, thus decreasing drag.
I thought that the main reason that breaking the water in front of you was that it broke the surface tension, not that it spaced out your deceleration over a greater distance.