A SEARCH is underway following the disappearance of a submarine that takes tourists on tours of the Titanic. Rescue crews have begun a desperate search of the Atlantic Ocean in a bid to find the vessel. It is unclear how many people – if any – were on board, reports the BBC. The Titanic sank on its maiden voyage to New York on April 14, 1912, after hitting an iceberg. Follow our missing Titanic submarine blog for updates...