A Royal Air Force search and rescue helicopter leaves RAF Valley as the search continues for the crew of cargo vessel The Swanland which sank off north Wales on November 27, 2011 in Anglesey, Wales. Five crew are still missing after the recovery of one body today. Prince William, the Duke of Cambridge, is a search and rescue helicopter co-pilot and took part in the rescue last night which saved two crewman. (Photo by Christopher Furlong/Getty Images)

An Irish Coastguard Rescue helicopter leaves RAF Valley as the search continues for the crew of cargo vessel The Swanland which sank off north Wales on November 27, 2011 in Anglesey, Wales. (Photo by Christopher Furlong/Getty Images)

People watch waves crash over the Holyhead breakwater as the search continues for the crew of cargo vessel The Swanland which sank off north Wales on November 27, 2011 in Holyhead, Wales. (Photo by Christopher Furlong/Getty Images)