His two other crew members are feared dead.
Mr Dickson said he was left clinging to his upturned boat and could see sharks circling around him. He feared it was only a matter of time before they attacked him.
But at the last minute, a group of dolphins appeared and scared off the sharks.
He was in the sea for several hours, before he was rescued by a passing ship.
Mr Dickson is now in hospital recovering from his ordeal, but is very grateful to the friendly dolphins who helped save him!