London 2012: Aquatics Centre's first swimmers
Events are being held in London to mark exactly one year until the opening ceremony of the London 2012 Olympic Games.
Team Great Britain synchronised swimmers performed in the pool of the newly unveiled Aquatics Centre as International Olympic Committee president Jacques Rogge and London Mayor Boris Johnson watched.
A group of local swimmers also participated in the event and were among the first to test the water.
27 Jul 2011