The best way to keep your dive gear and camera equipment safe and sound is not to take it cave diving. The alternative is to buy the toughest stuff you can find, and the following people assist me in supplying and repairing the equipment I use.
Aquatica underwater housing, inon strobes and all the associated accessories
Peter Mooney, ScubaPix
My Otter Brittannic drysuits, beloved for keeping me very dry
Damien Grigg, DKG Drysuit Repairs and Supplies
My rEvo rebreather and some fabulous instruction on using the thing from Marc Crane of TekDeep Asia
Photo by Duncan Price, taken in The Ressel in France