Diving with nitrox, completely fine and not that difficult. (Just don’t go below a certain depth or you’ll likely get oxygen toxicity.)
Diving with sharks? Fine, if you’re in a group and as long as they’re not great whites. Some other sharks can be aggressive sometimes but usually not to groups.
Baiting sharks? That’s playing with fire... totally stupid. Sharks see movement along with smelling blood so they’re as likely to eat you as the bait