The Vasa is displayed at the Vasa Museum in Stockholm,  on March 10, 2011. Sweden's 17th century royal warship Vasa, which sank in 1628 and was brought to the surface three centuries later, on Thursday began undergoing a major refurbishment, museum officials said.AFP PHOTO/JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)