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A temporary terminal's being built at Heathrow for the Olympics.
The airport says it's expecting its busiest day ever on August 13th.
It's also understood flights could be cut by up to 20% to prevent chaos.
There are also special measures for the 1000 guns being brought into the country for the shooting events.
Elite security teams in fast response boats and a helicopter take to the Thames later as part of a large scale security rehearsal ahead of the Olympics.
Scotland Yard and the Royal Marines are joining forces for a string of exercises to see how they'd deal with a terror attack.