The most ambitious charity fundraising event in the City of London’s history will see 40 thrill-seekers abseil down three of the capital’s most iconic buildings later this year.

The Outward Bound Trust City Three Peaks Challenge in association with The Royal Navy and Royal Marines Charity will see the first-ever descents of the outside of 30 St Mary Axe (‘The Gherkin’), The Leadenhall Building (‘The Cheesegrater’) and 20 Fenchurch Street (‘The Walkie Talkie’).

A strict maximum of just 40 philanthropists, adventurers and entrepreneurs will abseil 1,916ft in total, almost equivalent to the height of 142 double-decker buses, completing the descent of each tower one after the other.

In just a few spine-tingling hours, the event expects to raise over £4m in invaluable funds for The Outward Bound Trust (OBT) and The Royal Navy and Royal Marines Charity (RNRMC). This event follows the success of The Descent of The Shard abseil that The Outward Bound Trust organised back in September 2012 – which raised £2.8m.

This huge sum of money will unlock life-changing experiences for thousands of young people from all walks of life across the country through the work of The Outward Bound Trust. Outward Bound works in partnership with secondary schools and colleges to deliver outdoor residential experiences, focusing on how skills and experiences can be transferred back into the home, school or work environment - raising aspirations and developing effective leaders.

Equally, through the work of The Royal Navy and Royal Marines Charity, the money raised will fund projects and support services that give a helping hand to our nation's veterans and Service families.

The event will take place on Monday 7 September 2015, and will be the first of its kind at all three buildings.

The event will be facilitated by Royal Marines, who also assisted in the execution of the aforementioned Descent of The Shard event in 2012.

Each lucky participant or organisation taking part will commit to raising at least £100,000 for their triple abseil.

A unique challenge

Nick Barrett, Chief Executive of The Outward Bound Trust, said: “Never before has anyone abseiled down these three major London landmarks. This is an unprecedented and jaw-droppingly exciting challenge. We are very grateful to the Leadership teams of 30 St Mary Axe, The Leadenhall Building and 20 Fenchurch Street, who are helping to provide such a totally unique experience for everyone involved. The three buildings are icons on the London skyline, and were a completely natural fit with this event, which we hope the entire Square Mile will get behind. We are delighted to be working with them on such an exhilarating project.

"The opportunity to raise this kind of money in just one day does not come along very often and it will create new, life-changing opportunities for young people across the UK to change their attitudes, skills and behaviours as well as supporting serving personnel, veterans and families through the work of The Royal Navy and Royal Marines Charity.”

The event takes its inspiration from the long-running Three Peaks challenge, in which walkers try to climb the highest mountains of Scotland, England and Wales in the space of 24 hours.

The City Three Peaks is an opportunity for daredevils to seek their next adventure and for those afraid of heights to conquer their fears.