Lloyd Scott is best know for completing the London Marathon in a diving suit
A charity fundraiser is about to embark on his latest challenge by running a marathon 12,000 feet underground in the world's deepest mine.
Lloyd Scott from Rainham has been given permission from AngloGold Ashanti, one of the biggest gold mines in the world, to undertake the marathon.
He will be joined by colleague Charlie Vincent at the Mponeng mine, 50 miles west of Johannesburg.
"It's going to be pretty extreme down there," said Lloyd.
More than two-and-a-quarter miles down, Lloyd and Charlie will have to deal with the extreme heat.
"Apparently because of the pressure of the rock at that depth, it is actually 65ºC to touch, the walls are very, very hot," said Lloyd.
"You get these things called rock bursts where the rock quite literally explodes."
Lloyd told BBC Essex his greatest reservation was not being able to prepare for the conditions below ground.
"I've been told the workforce don't need any kind of oxygen, although it is like a pressurised environment because of the depth they are at," he said.
The 26-miles will be run on a loop basis.
"I think it goes to what they called 'stopes', which is where they kind of dig out for the gold," said Lloyd.
"It's going to be a little bit like an assault course, in and out and round. I know I've got to cross a railway line, so it goes to show you how industrialised it is even down at that depth."
Lloyd and Charlie complete the challenge on Sunday, 6 June in aid of the
Team England Footballers Charity.
Lloyd will also be starting the 2010 Race for Business on Wednesday, 30 June.
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