Australia relinquished a world record as 66 surfers in California rode a board together.
Surf champions and local heroes were among those who hung loose on a custom built, 42-foot board off Huntington Beach on Saturday.
The Orange County Register reports (http://bit.ly/1MVDajG) the 66 surfers rode a wave for 12 seconds.
They broke the previous record set in Queensland about a decade ago when 47 surfers rode a wave for 10 seconds.
About 5,000 spectators crowded the sand and the Huntington Beach pier to watch the attempt.
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Guinness World Record adjudicator Michael Empric said a separate record for whether the 590kg board is the world's largest will take a few days to determine.
