An underwater perspective at the London Olympics

Italy's Giulia Lapi and Mariangela Perrupato are seen underwater as they perform in the synchronised swimming duets technical routine qualification round during the London 2012 Olympic Games at the Aquatics Centre on Aug 5, 2012.  -- PHOTO: REUTERS

Competitors are seen underwater as they jump into the pool to await the start of their men's 200m backstroke semi-final during the London 2012 Olympic Games at the Aquatics Centre, Aug 1, 2012. -- PHOTO: REUTERS

(From left to right) Spain's Judit Ignacio Sorribes and Mireia Belmonte Garcia, Japan's Natsumi Hoshi and Australia's Jessicah Schipper are seen underwater as they swim in the women's 200m butterfly heats during the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

(From right to left) Caitlin Leverenz of the US, China's Ye Shiwen, Australia's Alicia Coutts, Australia's Stephanie Rice and China's Li Jiaxing are seen underwater as they swim during the women's 200m individual medley semi-finals at the London 2012 Olympic Games at the Aquatics Centre, July 30, 2012. -- PHOTO: REUTERS

Spain's Mireia Belmonte Garcia (left to right), Denmark's Lotte Friis, Britain's Rebecca Adlington and Katie Ledecky of the U.S. compete in the women's 800m freestyle final during the London 2012 Olympic Games at the Aquatics Centre, Aug 3, 2012.   -- PHOTO: REUTERS

Canada's Meaghan Benfeito and Roseline Filion (back) are seen underwater after they performed a dive during the women's synchronised 10m platform final at the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

(From top to bottom) Australia's Alicia Coutts, Ariana Kukors of the U.S. and Australia's Stephanie Rice are seen underwater as they swim in the women's 200m individual medley final during the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

South Africa's Chad le Clos and Michael Phelps of the U.S. compete in the men's 100m butterfly final during the London 2012 Olympic Games at the Aquatics Centre, Aug 3, 2012.  -- PHOTO: REUTERS

Competitors are seen underwater as they swim in the women's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre, Aug 1, 2012. -- PHOTO: REUTERS

Mexico's Alejandra Orozco (front) and Paola Espinosa are seen underwater after performing a dive during the women's synchronised 10m platform final at the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

China's Sun Yang is seen underwater after a false start in the men's 1500m freestyle final during the London 2012 Olympic Games at the Aquatics Centre. Aug 4, 2012. -- PHOTO: REUTERS

Britain's Jemma Lowe (left) and China's Liu Zige  are seen underwater as they swim in the women's 200m butterfly heats during the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

Canada's Meaghan Benfeito and Roseline Filion (right) are seen underwater after they performed a dive during the women's synchronised 10m platform final at the London 2012 Olympic Games at the Aquatics Centre, July 31, 2012. -- PHOTO: REUTERS

(From top to bottom) Poland's Radoslaw Kawecki, Ryan Lochte of the US and China's Zhang Fenglin are seen underwater as they swim in the men's 200m backstroke heats during the London 2012 Olympic Games at the Aquatics Centre, Aug 1, 2012. -- PHOTO: REUTERS

Anthony Ervin (left to right) of the US, Brazil's Cesar Cielo, Cullen Jones of the U.S. and Bruno Fratus of Brazil compete in the men's 50m freestyle final during the London 2012 Olympic Games at the Aquatics Centre, Aug 3, 2012.  -- PHOTO: REUTERS

Britain's Tom Daley (left) and Peter Waterfield swim to the side after performing a dive in the men's synchronised 10m platform final during the London 2012 Olympic Games at the Aquatics Centre, July 30, 2012. -- PHOTO: REUTERS

Ruta Meilutyte of Lithuania swims in the women's 50m freestyle heats during the London 2012 Olympic Games at the Aquatics Centre, Aug 3, 2012   -- PHOTO: REUTERS

Spain's Ona Carbonell Ballestero and Andrea Fuentes Fache are seen underwater as they perform their routine in the synchronised swimming duets technical routine qualification round during the London 2012 Olympic Games at the Aquatics Centre on Aug 5, 2012. -- PHOTO: REUTERS

France's Labrousse and Willhelm perform in the synchronised swimming duets technical routine qualification round during the London 2012 Olympic Games. -- PHOTO: REUTERS

Argentina's Sanchez and Sanchez perform in the synchronised swimming duets technical routine qualification round during the London 2012 Olympic Games. -- PHOTO: REUTERS