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
A man from London who was the subject of cruel online taunts has had the last laugh when a group of celebrities threw a party for him in LA.
Taffazul Hoque is 38 but suffers from autism and epilepsy. He is in danger of having a seizure and is sought urgently by his family.
Rachel Key told ITV London she was really nervous about presenting the trophy, but as a lifelong fan, supremely honoured.