Running with a camera strapped to his head, athletic James Heptonstall made a mad dash from Mansion House to Cannon Street tube stations.
James left his friend Noel Carroll on the Circle line train and sprinted 380 metres between the two stations, to the amazement of fellow passengers.
They thought it was Mission Impossible, but the England touch rugby player proved them wrong, running up some steps and along the road to Cannon Street station.
As the train pulled into Cannon Street, Mr Heptonstall came down the stairs onto the platform and leapt on to the same carriage he had left just 80 seconds earlier.
He collapsed on the floor of the train to get his breath back, while gobsmacked passengers applauded.
A video of the race made by James and Noel has now become a big hit on YouTube.
In an interview with the Evening Standard, Mr Heptonstall said: “While I was running someone asked Noel what I was doing. They said they did not think I would make it.
“The other passengers were all waiting on tenterhooks. But then I dived into the Tube and they were applauding.”