You must have found yourself in some extraordinary situations while photographing sharks. What's been the most difficult?
"One of the most challenging has been trying to get a wide-angle, extreme close-up shot of a great white shark breaching from the low angle of the ocean surface. I needed to have a specially designed towing craft built, which I put my camera on less than 30cm above the water's surface, with the front of the lens completely exposed to the elements. The camera was then towed less than three metres away from where we hoped a shark would jump.
"Each day was terrifying, as having very expensive gear next to the water and a one-tonne shark jumping so close, possibly sending hundreds of litres of water over the camera, was high risk. I needed to send a signal from a handheld remote to another receiver, which would be relayed to the camera trigger to open and close the shutter, so I needed very fast reflexes, as a breach lasts less than a second. For two weeks I held that tiny trigger, my heart in my throat, waiting for that split second of action. We tried to pick days with clouds to add drama to the scene and light winds, so that meant having to sit on shore a lot until we had these conditions, as I wasn't going to risk all my gear for anything less than an exceptional chance.
"With just one day to go, everything came together, and suddenly a three-metre shark launched itself into the air with an unbelievably high breach, all while turning in perfect profile at the apex of the jump. It was the ultimate shot I could have hoped for, one which does the athleticism of these amazing predators justice. High risk, high reward."