Actually, regardless of B.O.B.'s intentions, it's a valid question - say you were a victim of, for example, explosive decompression over water, what's the maximum speed you could be expected to hit the sea and survive?
I saw a documentary on the Piper Alpha disaster once, and if I remember one survivor said they are advised not to jump into the sea from the rig if you are any more than 100ft up as you might as well jump onto concrete.
if you drop something heavy in front of you it breaks the surface tension of the water and makes it "softer" to jump into.. so be the second guy to jump off.. and no more than a second behind him...