That's a big race for an Ironman triathlon. But unlike most IM races Ironman Louisville is different in that it doesn't feature a mass swim start. Instead triathletes line up on a pier and jump into the Ohio River one at a time.
2012 was no exception with amateur and professional triathletes from around the country and around the world setting out on their 140.6 mile journey with just one jump into the warm river.
These are the sights and sound of the swim portion of the 2012 Ironman Louisville race.