Underwater out-take

I was trying to re-create the underwater shot I did last August 12th, as I'm sure that I can now get much deeper underwater and stay there for longer - Mark has been "training" me by getting me to retrieve small objects from the bottom of the pool. Something seems to go quite wrong when I try to take a photo of myself however. I think the combination of concentrating on being underwater and then doing a simple task like taking a photo is still too much for me! I quite liked this "out-take" shot though, another sea monster lurking in our pool perhaps?!