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Fisher said he and Mettraux were under cover in the cockpit while sailing downwind with one reef in the mainsail when the boat nose-dived into a large wave and they heard a loud bang.

On the other boats, the helmsman has to dash around the back of the mainsail to the other side of the boat when it tacks or jibes.

American Magic seems to have particular control problems with its small rudder and when the mainsail is eased and it comes to the top mark powered up.

"A massive thank you to all the guys who helped," American Magic mainsail trimmer Paul Goodison told the New Zealand Herald.

It was also a traumatic experience for the crew, some of whom briefly were trapped under the giant mainsail when the 75-foot yacht tipped over on its port side.