Won't he be going terminal velocity by the time he hits, hence won't the water feel like cement? Not to mention it's salt water, hence more dense than regular water.
You fucking idiots, you are lucky to live through a crash into water at under 100 feet. The concussion alone will knock you silly and you drown, and that's if you're lucky or disciplined enough to go in feet first. From 300 feet, you just die.