Titanic cross section. Cross section of the Titanic to show how passengers get on to deck. The main way on to the upper decks was up the grand staircases, with which the first class passengers were familiar. The third class exits are through emergency doors. Titanic was built by Harland & Wolff in Belfast Ireland during 1910 - 1911, and sank on 15th April, 1912, after striking an iceberg off the coast of New Foundland during her maiden voyage from Southampton, England to New York, USA, with the loss of 1,522 passengers and crew.