Not sure what's more scaring to dive with an expensive camera in a just rented under water case or staying in a shark cage meeting the ones the cage was built for?
In shallow water there is a kind of feeling you can get your gear out as pronto as possible. Which certainly is a false idea.
Different depths give different colors and the deeper you get the less color is to capture unless you'll use additional light.
If you see one of these you'll have most of the time second thoughts. But actually at this time you don't have any possible chance to get out.