Oracle's preparations for defending the America's Cup have suffered a setback when their AC72 class catamaran capsized on San Francisco Bay suffering substantial damage.
It was only the eighth time Oracle had taken the massive catamaran, the class of yacht which will used in the Louis Vuitton challenger series and the America's Cup on to water for training since it was launched in August.
The boat has floated under the Golden Gate Bridge, with its 40 metre wing mast and rigid sail damaged nearly beyond recognition.
None of the crew were hurt in the capsize, but the team are having trouble getting the catamaran back to base.
Tactician Tom Slingsby says the boat was preparing to turn away from the wind when it capsized stern over bow
Team New Zealand have said their boat can reach speeds of almost twice that of the prevailing wind.