Deep water overwhelms me. If I can't touch the bottom with my feet i get a panic on and start flapping. I can happily bob around the pool with H if I'm on his back or whatever, cos I trust he won't let me drowned but one year in Greece the holiday rep saw h pushing me around in a blow up ring and thought it would be funny to tip me over. I could just hear H saying 'honestly mate, don't do that..' And then I was over and in. All very amusing I imagine but I kicked up such a fuss. The shock of it had me in a shaky mess *blush*. The poor rep for a gobful too.
Strangely I don't know why I'm so scared of deep water but my mum said I used to wake up as a very young child, around 2, screaming from nightmares about sinking on a big ship!