In my question What is the largest achievable oxygen-atmosphere world?, my answer suggests an atmosphere of standard terrestrial air with a sea-level pressure of 20 ATM and platforms at an altitude of 25,250m above sea level.
This world is a water world, with a deep global sea. At the 1 ATM altitude, humans live on a number of suspended platforms. Surface gravity is 1g.
If an unprotected human was to fall from one of the platforms - or indeed from any other height between 5,000m and 31,000m, and didn't suffer from Nitrogen narcosis or Oxygen toxicity on the way down, would they be able to survive the fall into the ocean below? Would their potential survival depend upon maintaining a correct posture to minimise terminal velocity and to transition to a diving posture just before impact, or could they survive even if unconscious and falling in entirely the wrong postures? What physical condition might they be in after such a fall?
In other words, disregarding other environmental factors, would the terminal velocity of a fall through such an atmosphere be sufficiently low that a human might survive a fall into water?