Net that fish in a flash
The SeaLife Digital Pro Flash has tested to a depth of 60 meters with an effective underwater range of 2.5 meters.
The SeaLife Digital Pro Flash is a universal flash that can be used with most digital cameras. Tested to a depth of 60 meters with an effective underwater range of 2.5 meters, the SeaLife flash operates on four AA batteries for a total of about 100 exposures. It also features an auto flash intensity setting to keep you from having to second-guess your exposure settings--which is the last thing you need that far under the surface.
(Source: Crave Asia)