Who was the second explorer to reach the South Pole?

Robert Falcon Scott reached the South Pole on 17th of January, 1912, acknowledging in his diary that Amundsen had got there a month earlier. The last members of the Scott expedition were found dead by a relief party two years later in 1913.

Roald Amundsen and Robert Falcon Scott both explored the South Pole at the same time in 1911. Amundsen was aware of Scott's objective, but Scott was not aware that Amundsen was right behind him.

Roald Amundsen got there first on 14th of December, 1911. Amundsen reported that he saw no sign of Scott.