Geoff Workman, 84, was called back into action nearly fifty years after spending 105 days underground.
The potholer, who spent the time underground just to prove that it could be done in 1963, received a call to his North Yorkshire cottage when 33 miners became trapped underground in 2010.
Engineers at the mine in Chile wanted his advice on how to help the miners survive their incarceration.
It is 50 years since Geoff Workman entered the record books. he has celebrated by returning to the cavern where he set his world record. Geoff, now 84, spent 105 days living 100ft underground, in the dark and alone.
At the time it was thought to be beyond human endurance to live underground for so long. Geoff had aimed to stay in the cavern for 100 days but without a clock or daylight his body clock slowed down and when he emerged from the cave he had actually been underground for 105 days.
Geoff went back to the cave with ITV reporter Julia Barthram to relive his triumph.
A man from North Yorkshire, who lived in a cave for 105 days, has spoken about how he could not accept that humans could only endure two months in the conditions. Geoff Workman is celebrating 50 years since he broke the world record.
A man from North Yorkshire is celebrating 50 years since he became a world record holder. Geoff Workman shocked the world with his endurance level when he lived 100 feet underground for 105 days. He was trying to beat the record of two months.
Geoff has been back to mark five decades since his triumph.