The Independent has this interesting piece on shipwrecks around the Spanish coast
Spain’s seabed is home to the wrecks of hundreds of ships laden with treasures plundered during the country’s imperial zenith. Now the battle is on to reclaim them.
Maritime historical experts say that, scattered around the Spanish coastline, lies more gold and silver than in the vaults of the Bank of Spain. There are said to be the 700 shipwrecks, from Roman barges, to Spanish Golden Age galleons and British aircraft carriers. Read
See also Shipwreck in Galicia