<font color='#000080'>You could try :-
http://www.camerasunderwater.co.uk
They seem to be able to get most things and very helpful too.
Daz
P.S I use a red filter (UR-Pro blue water) filter on my video camera and the results are much improved within a certain depth range.
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Underwater rock juggler extraordinaire
Breathe in, breathe out. Repeat as necessary