A British Royal Marine Sea King helicopter carrying the Olympic flame flies past the Tower Bridge in London, as it arrives to the Tower of London, Friday, July 20.Opening ceremonies for the 2012 London Olympics will be held Friday, July 27 (AP Photo/Lefteris Pitarakis).

British Royal Marine Martyn Williams, 23, with a lantern with the Olympic flame strapped to his body, abseils from a Sea King helicopter, by the riverside at the Tower of London (AP Photo/Jae C. Hong).

British Royal Marine Martyn Williams rappels down from a Royal Navy Sea King helicopter into the Tower of London with the Olympic torch (AP Photo/Jae C. Hong).

British Royal Marine Martyn Williams poses for the photographers with the Olympic flame at the Tower of London (AP Photo/Lefteris Pitarakis).

British retired champion Dame Kelly Holmes, left, poses for the photographers with the Olympic flame, along with British Royal Marine Martyn Williams (AP Photo/Lefteris Pitarakis).

British Royal Marine Martyn Williams with a lantern with the Olympic flame strapped to his body, abseils from a Sea King helicopter, by the riverside at the Tower of London (AP Photo/Lefteris Pitarakis).

A crowd gathers beneath the Olympic Rings on the Tower Bridge in London, as they wait for the Olympic Torch to arrive at the Tower of London (AP Photo/Charlie Riedel).

British retired champion Dame Kelly Holmes carrying the Olympic Flame in the grounds of the Tower of London, during Day 63 of the Torch Relay. (AP Photo/LOCOG, Yui Mok).

British retired champion Dame Kelly Holmes pose for the photographers with the Olympic flame at the Tower of London (AP Photo/Lefteris Pitarakis).

Great Britain supporters waving their flags ahead of their Olympic Men's friendly soccer match between Great Britain and Brazil at the Riverside Stadium, England, July 20 (AP Photo/Scott Heppell).

Great Britain's coach Stuart Pearce, looks on ahead of their Olympic Men's friendly soccer match against Brazil at the Riverside Stadium (AP Photo/Scott Heppell).

Brazil's Oscar, left, vies for the ball with Great Britain's Danny Rose, right, during their Olympic Men's friendly soccer match at the Riverside Stadium (AP Photo/Scott Heppell)

Torchbearer Abdul Kasam carries the Olympic torch at the Tower of London (AP Photo/Jae C. Hong).

Torchbearer Abdul Kasam carries the Olympic torch at the Tower of London (AP Photo/Jae C. Hong).

Torchbearer Abdul Kasam holds the Olympic torch at the Tower of London (AP Photo/Jae C. Hong).

General the Lord Richard Dannatt, left, Constable of the Tower of London, holds the Olympic torch as he is joined by London Mayor Boris Johnson at the Tower of London (AP Photo/Jae C. Hong).

Performers for the opening ceremony walk through Olympic Park, with the velodrome seen behind, on their way to a dress rehearsal at the 2012 Summer Olympics, Friday, July 20 (AP Photo/Ben Curtis).