Prince William took part in the rescue of Russian sailors whose cargo ship sank.
Prince William co-piloted a helicopter which rescued two crew members.
Five people remain missing after the cargo ship sent a mayday call .
The rescue effort was described as frantic after gale-force winds battered the cargo ship.
Prince William co-piloted a helicopter which rescued two people after a cargo ship sank in a storm off the Welsh coast, leaving one man dead while two were winched to safety by helicopter, officials said.
A sea search was underway on Sunday for five Russian crew members.
The two rescued members of the crew, who were transporting 3,000 tonnes of limestone from Colwyn Bay in Wales to Cowes on the Isle of Wight, were found clinging to lifeboats in the water.
They were winched up by a Sea King helicopter co-piloted by Prince William, who works at RAF Valley in north Wales, the Ministry of Defence said.
Another crew member was found in the water later in the morning but has been confirmed as dead, the Maritime and Coastguard Agency said.