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 drysuit, beloved for being orange (and keeping me very dry)
Damien Grigg, DKG Drysuit Repairs and Supplies
Armadillo sidemount system and dive accessories, and a fabulous place to stay
Grant Pearce, AquiferTec and Pine Tank Dive Lodge