Video: Aftermath of tragic catamaran accident in which British Olympian Andrew Simpson died

A double Olympic medallist has been killed during a training session in San Francisco Bay after he became trapped under a 72-foot catamaran.

Andrew 'Bart' Simpson was training with his team mates on the Swedish America's Cup challenger Artemis when the vessel overturned.

Simpson won Gold at the 2008 Beijing Olympics and Silver with Iain Percy in the Star keelboat at last year's Games in London.

For more on this story:

Double Olympic medallist Andrew 'Bart' Simpson killed in training accident in San Francisco Bay

Stuart Alexander on Andrew 'Bart' Simpson tragedy: Some see these super-powerful 72-foot catamarans as death traps