Survivors and relatives gathered on Saturday to recall the sinking of the Baltic ferry Estonia, in which 852 people died in the biggest shipping disaster in European post-war history. They commemorated the tragedy in a memorial service held at the Estonia Monument on the island of Djurgården in Stockholm, joined by the Swedish royal couple. King Carl XVI Gustaf and his wife Queen Silvia laid a wreath, as did Prime Minister Ulf Kristersson and ambassadors from several countries. All observed a minute’s silence. “It is so important that we remember,” the king said. “To honour the dead, the survi…