For many, diving into a shark tank and spending hours every day among the deadly creatures would be a terrifying thought.
But for one man, spending up to seven hours a day swimming with more than 10 sharks is just part of his daily work schedule.
That's because Matt Martin, 35, is a professional shark tank cleaner at the Blue Planet Aquarium in Cheshire and heads up a team which takes more than 1,000 dives in the 3.4million litre tank every year.