I cant find the origional Video...The narrative has been overdubbed with music on this one and the fillming is not as good...If you turn it up lode you can hear some of the origional narrative under the music....
To much back stay pressure
and probably a flaw in the hull or design...although the latter seems unlikely with the money , and quality control theses boats get..Didnt take long did it!!!!
YouTube - America's Cup - boat sinks and breaks