openwater

Just your average 10-kilometer swim race. (Martin Bernetti -- AFP/Getty Images)

Just your average 10-kilometer swim race. (Martin Bernetti — AFP/Getty Images)

Swimmers compete during the men’s 10km open water swimming marathon at the London 2012 Olympic Games on August 10, 2012 at Hyde Park in London. AFP PHOTO / MARTIN BERNETTIMARTIN BERNETTI/AFP/GettyImages