During his climb up the Gherkin today, Lloyd Scott MBE is wearing at 1940s diving suit that weighs 140lbs, or 10 stone.
The antique suit, complete with solid copper helmet, means that the cumulative weight Lloyd will lift during his climb is 66 metric tons.
It's not the first time Lloyd has been seen in one of these suits however. He's completed a number of marathons in one, including the London Marathon in 2002 when he broke the record for the slowest time, taking almost six days to complete it.
He was also the first person to complete the 2012 Olympic Marathon Route, again wearing one of the suits. He was barred from competing in the actual race as it was ruled that competitors have to finish on the same day the race starts.
More top news
Handyman Paul Thrower died after two 18-year-olds hacked at him with a 4ft long axe and stabbed him 10 times at a block of flats.
The 34-year-old victim was left with a huge gash across her nose and face. Police need to find a man seen on CCTV.
The girl was travelling on a train from London Liverpool Street to Romford in Essex after going to see the poppies at the Tower Of London.