On learning the Bora Bora snorkelling trip included stops to swim with sharks, it was a no-brainer; I couldn’t sign-up fast enough. Swimming with sharks is amazing, but swimming with them in their natural habitat, in the Bora Bora lagoon, and then in the open ocean? What could beat that? As the boat left our hotel dock it was clear there was an air of nervous anticipation among the passengers. For the lucky folk who have the chance, swimming with sharks is usually a once in a lifetime opportunity. A look at the faces on the boat told me most people were doing it for the first, and possibly only,…