I think there’s a point beyond which it doesn’t matter. I forget what the number is, but I’ve read that hitting water above a certain height (which isn’t actually very high) is like hitting concrete. The surface tension is too high for certain entry velocities, and that vertical entry isn’t just good form. It’s keeping the dive from killing you. My understanding is that the entry depth isn’t linear with entry speed, it’s more of an inverse exponential thing. So a certain fairly modest depth of water is enough for any survivable jump. Really amazing that people will attempt this.
This is apparently a big thing that movies have lied to us about- that any fall is okay if there’s enough water to land in.
