Janiv Patel has already completed 10 of the 11 London Underground lines on foot, raising more than £18,000 so far for the British Heart Foundation.
He hopes to reach his £20,000 target with his final walk.
Smiles at Stratford Station as walkers mark progress on the Tube challenge (Image: justgiving.com/janivpatel) Mr Patel said: “Any donations to this worthy cause are hugely appreciated.”
The challenge began in 2016 when he walked the length of the Central Line, covering 49 stations in 23 hours and 49 minutes.
Since then, he has completed a different line each year, including the Circle, Jubilee, Northern, and District lines, as well as a combined walk of the Bakerloo, Victoria, and Hammersmith & City lines in 2023.
Each walk is completed in one continuous journey without sleep.
The walks are dedicated to his aunt and grandmother, who both died from heart failure.
His final challenge will take place on August 30, when he will walk the full length of the Piccadilly line, visiting all 53 stations over an estimated 32 hours.
Supporters join at Canning Town Station during London Underground charity walk (Image: justgiving.com/janivpatel)
Mr Patel said: “Thank you for visiting my JustGiving page where you’ll read about my Walk the Lines challenge to walk the length of the 11 London Underground lines.
“This has been arranged to raise money for the British Heart Foundation in memory of my aunt and grandmother.”
The Piccadilly line walk will start at South Ealing, include all three Heathrow stations, travel out to Uxbridge, and finish at Cockfosters.
Supporters can follow his progress via a live GPS tracker on the day of the walk, and can donate to the cause on his JustGiving page at www.justgiving.com/fundraising/janivpatel.
While Mr Patel will complete the entire route solo, friends and family plan to join him for sections of the walk.
He has chronicled each challenge with photos at every station along the way, sharing updates on his Instagram page @janiv_patel and Facebook (Janiv Patel).
The British Heart Foundation has recognised his fundraising efforts each year.