Your golden gate bridge comparison is actually quite an apt comparison, but not in the way you thought it would be. Jumping off of a diving board, you can dive 9 or 10 feet down without swimming. People who have ended up in a dive off of the golden gate bridge go *significantly* deeper, and many have survived. There was a teenager a couple years ago that not only survived a dive, but was swimming back to shore when the coast guard picked him up.
Guess it also depends on how you hit the water. My diving technique sure as hell is not good enough to slice through the water. Very interesting none the less. I am more the semi wad cutter bullet, not the Spitzer