A Royal Marine Commando will abseil with the Olympic flame into the Tower of London today.
Royal Marine Martyn Williams will arrive at Tower Wharf this evening in a Royal Navy Sea King helicopter, and will undertake the 180ft abseil from the aircraft
The torch will then be carried around the Tower by an athlete and a Tower of London-nominated torchbearer. It will be welcomed by Mayor Boris Johnson and Lutfur Rahman, the mayor of Olympics host borough Tower Hamlets.
The flame will then be handed over to General the Lord Dannatt, Constable of the Tower of London.
The torch will spend the night under guard at the 11th century Tower.
The Tower has already been pressed into Olympic service as a secure location where Olympic medals have been stored ahead of the Games.
Members of the public have been warned that the brief moment when the torch abseils into the Tower is best watched on television, as the view will be obscured on the ground.
The torch begins its journey today in Maidstone, Kent, and will travel 105 miles to Guildford in Surrey.
Former athlete Roger Black will be one of 140 torchbearers to carry the Olympic flame.
Black, 46, who will carry the flame in Godalming, Surrey, represented Great Britain at athletics for 14 years and overcame serious injuries and setbacks during his career.
He triumphed twice in the Atlanta 1996 Olympic Games where he won silver in both the 400m and the 4x400m relay. He retired in 1998.
David Boyle, 47, from Tonbridge, was the first torchbearer of the day to carry the flame in a rowing boat at Maidstone Rowing Club.
You can see how he got on here:
Mr Boyle, who has been a member of the Salvation Army all of his life, participates in personal counselling, helping lonely people and the elderly, and assisting the jobless to find employment. He is also a hospital radio presenter.
Scout and Cub leader Christopher Bury, 17, will also carry the flame in Maidstone - his home town.
He was nominated by Maidstone Borough Council through the Locog campaign for helping others and giving his time to benefit the wider community.
The flame will be taken around the track at Brands Hatch by a torchbearer before making its way to Sevenoaks and crossing the county border into Surrey.
Other torchbearers include blind Ben Breen, 18, from Kent, who was chosen through the Coca-Cola Future Flames programme, and Tim Lawler, 45, chief executive officer of SportsAid, who will carry the flame in Dorking, Surrey.
Torchbearer Daniel Eley, 34, who is carrying the flame in Godalming, had worked with street children in South America for three years when he broke his neck diving into a river.
His insurance did not cover his repatriation and he was kept in a Colombian hospital until an internet campaign raised sufficient funds to bring him home.
Mr Eley had to undergo intensive rehabilitation and he still needs regular medical attention.
The evening celebration will take place at Stoke Park, Guildford, where the last torchbearer of the day will be Austin Playfoot.
The 82-year-old was a torchbearer in 1948 and helped to launch the torch design under the Olympic rings in St Pancras International station in June 2011.
The torch will then be whisked to London by military helicopter.