Narration: Although experienced, cameraman Richard Woolocombe was understandably anxious. Richard: I have never dived with tiger sharks. And I'm incredibly excited on the one hand to see tiger sharks, but also somewhat reticent, knowing they have such a dangerous reputation Narration: So shark expert and photographer Doug Perrine was hired to watch his back. Doug: And then in one hand, I'll have an aluminium camera housing, and in another hand, I'll have this hi-tech shark billy. And then it's just a matter of giving them a little poke to let them know that you're alive and capable of defending yourself. Narration: The moment of truth had arrived. Mark: Bird on the water, 80 yards to the right. Narration: It was time to swim with tiger sharks. Pulling the boat up at a respectful distance from the bird, the divers' final approach was from underwater. To stop any surprise attacks from a shark beneath them, they hugged the sea bed. But the bird was long gone. They waited back-to-back for a tiger shark to show. None did. But as they surfaced, a shark appeared Mark: Right behind you! Shark right behind you! Richard: It's a pretty intimidating sight to see a shark that big and that fat. it's a huge girth, absolutely incredible girth.