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, which is used for tours of the spot where the Titanic sank. It is unclear how many people were on board, reports the BBC. However, a British billionaire named Hamish Harding has been confirmed to be one of the missing passengers. The Titanic sank on its maiden voyage to New York on April 14, 1912, after hitting an iceberg – and has been seen as one of history’s major nautical disasters ever since. Follow our missing Titanic submarine blog for updates...