David Doubilet: We’ve been very lucky. Never been bitten by a shark or never been bitten by a crocodile.  What’s very funny is we spend a lot of time with sharks, everything from great white sharks to just recently, reef blacktips and great reef sharks and fakarava in an atoll in French Polynesia — one of the most astounding places we’ve been — in Cuba, in Australia. But crocodiles — crocodiles are really quite frightening because I think we’re used to being with an animal that’s in the water, but a crocodile is a dinosaur, unpredictable and extremely fast when it has to be, and yet has this idea of you’re swimming with dinosaurs.