Ford Ironman Louisville: Is this the hardest endurance test ever?

There have been many events that have seemed like very hard endurance tests but many see the Ironman as the hardest. The people who participate in this have to do a 2.4 mile swim, a 112 mile cycle a 26.2 mile run.Over 2,100 people have registered for this event, the event starts at 6.50 am and athletes are given until 12.00 midnight to finish the race, the fastest of the athletes will finish about 3.00pm while the slowest will still be cycling when the event finishes.

What do you think of the athletes competing?

How will the Ironman Louisville compare to past events?

Is this the hardest endurance test and triathlon?