For every athlete, going to the Olympic Games is an amazing achievement, but perhaps the most astonishing is that of swimmer Ahmed Kelly.
Ahmed was born in Iraq with severely deformed arms and legs, believed to be from his parents being exposed to chemical weapons.
Ahmed and his brother Emmanuel were raised by the nuns of the Mother Teresa Orphanage in Baghdad.
Emmanuelle had been dumped in a box on a street, and Ahmed on the front door of the orphanage.
Both were born with severely underdeveloped limbs.
They were found by Moira Kelly, a Melbourne humanitarian worker, and brought to Australia in 2000 where they had life-changing surgery.
With his new prosthetic limbs, Ahmed played Australian Rules for his school and local club, but when that became too physically taxing, he decided, against his instincts, to take up swimming.
"When I came to Australia for the very first time, I had a taste of what a pool was, but I was absolutely petrified of the pool, I was screaming, but of course everyone who comes to Australia has to learn to swim and do their swimming lessons, but it took at least two years to do all the swimming lessons." Ahmed Kelly said.