Waterproof HD Camcorder

[Rental]

I've been thinking about getting this in the coming months (when I can track one down in the UK):
http://www.sanyo.com/xacti/english/products/vpc_ca9/index.html

How safe would these be to use in an aquarium?

Does anyone have any other suggestions for rugged/waterproof/compact HD camcorders?

[Hugh Janus]

Sony Sportpack works for me. I'll upload some footage I took with mine last night for you.