The man, named by the BBC as 22-year-old Matthew Bryce from Glasgow, was reported missing after he set off to go surfing on Sunday morning from a beach near Campbeltown off the Scottish west coast, sparking a large search operation.
He was finally located on Monday evening, still with his surf board after being spotted by a rescue helicopter.
"Hope was fading of finding the surfer safe and well after such a long period in the water and with nightfall approaching we were gravely concerned," said Dawn Petrie from Belfast Coastguard Operations Centre in Northern Ireland which coordinated the search.
(Reporting by Michael Holden; editing by Guy Faulconbridge)
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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