Competitors swim during the men's 200m freestyle final at the London 2012 Olympic Games
(From L to R) Britain's Robbie Renwick, Ryan Lochte of the U.S., South Korea's Park Tae-hwan, China's Sun Yang, France's Yannick Agnel and Germany's Paul Biedermann are seen underwater as they swim during the men's 200m freestyle final at the London 2012 Olympic Games at the Aquatics Centre July 30, 2012. REUTERS/Michael Dalder (BRITAIN - Tags: SPORT SWIMMING OLYMPICS)