Work on the �300 million 2012 Olympic aquatics centre reached a major watershed with the completion of its wave-shaped roof. The steel structure was lowered into place yesterday completing what was one of the most complex engineering and construction ch

Work on the �300 million 2012 Olympic aquatics centre reached a major 'watershed' with the completion of its wave-shaped roof.

The steel structure was lowered into place yesterday completing what was one of the most complex engineering and construction challenges at the Olympic Park.

The 160m long sweeping roof frame, weighing more than 3,000 tonnes, rests on just three concrete supports. The landmark will act as gateway to the Olympic Park.

The venue will hold 17,500 spectators during the Games, but the capacity will be reduced to 2,500 afterwards. It will provide two 50m swimming pools and a diving pool for community and elite use after the Games.