Lloyd Scott has completed his charity climb up the Gherkin in a deep diving suit in a total time of 2 hours and 53 minutes.
He climbed 38 floors and a total of 1,037 steps in the 10 stone suit - and told ITV London how he felt at the top.
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The station, which saw 44m people commuters use it in 2016/2017, will be transformed into a dining room complete with Christmas decorations.
Part of the monster fatberg will go on display in the Museum of London, while the rest of it will be converted into biodiesel.
Major engineering projects at key London stations mean hundreds of trains will be cancelled or diverted.