 In the movie, Jack is a 3rd class passenger on the Titanic who  sneaks his way up to first class with the hopes of never getting  caught. In the real disaster in 1912, Third Class Passenger Hilda  Maria Hellström, really did sneak up to first class out of curiosity  and never got caught, however she was in her 3rd class cabin when  the Titanic hit an iceberg and ended up surviving the sinking by  boarding one of the last lifeboats to leave, Collapsible C.