This is where you go rock climbing with no ropes, over deep water. You typically want to be doing this on a cliff that's overhung, also, otherwise the soft cushiony effect of the water is somewhat negated by the bits of cliff you have to bounce off before you get to it, should you fall (and you should, it's a wicked rush).

The main problem with DWS, apart from, obviously, the fear, is that of your chalk bag getting soaked. The best thing to do is either to chalk up thoroughly beforehand, or not to fall off.

For me, this is the best, simplest, purest form of climbing there is. On a hot summers day, you can forget about ropes, gear, all that crap. No need to worry about safety, you've got a nice soft sea to fall into. Just climb.

Maybe go for a nice, if unintended, swim.