A British Divers Marine life spokesman said the whales that had died, had died naturally.
He said several whales were refloated by BDMLR volunteers, some turned back into the harbour and the rest were waiting at the harbour entrance.
The operation is ongoing, he added.
More top news
The 23-year-old dived to his second World Championships 10-metres platform title in Budapest on Saturday.
Heavy rain continues across southern Scotland/northern England and the southwest.
Staff at the hospital treating critically-ill baby Charlie Gard have received "shocking" abuse including death threats over the case.