Rachel Graham studies sharks. She live captures, measures, tags and releases them. When she asked if I would document some field work for her (actually it was an assignment for Men's Journal), I jumped at it. There is little I find more exciting or adrenaline pumping than swimming with a tiger shark, even if it is controlled by a line around its caudal fin. The film crew is from National Geographics "Born to Explore" series, and yes that is the star of the show Richard Wiese

Image may contain: sky, outdoor and water