1968 Olympic Games. Mexico City, Mexico. Men's 10000 Metres. Australian doctor Brian Corrigan weeps as he gives Australia's Ron Clarke oxygen after he collpased at the end of the race. Clarke failed to win a medal. [Getty Images]

1968 Olympic Games, Mexico City, Mexico, Men's 10000 Metres, Australian doctor Brian Corrigan weeps as he gives Australia's Ron Clarke oxygen after he collpased at the end of the race, Clarke failed to win a medal (Photo by Popperfoto via Getty Images/Getty Images) — see more

1968 Olympic Games, Mexico City, Mexico, Men's 10000 Metres, Australian doctor Brian Corrigan weeps as he gives Australia's Ron Clarke oxygen after he collpased at the end of the race, Clarke failed to win a medal (Photo by Popperfoto via Getty Images/Getty Images)