Bringing 1997's Titanic to life was a massive undertaking.

Unsurprisingly, James Cameron's epic — which tells the story of the British luxury passenger liner's tragic maiden voyage in which more than 1,500 passengers died when the vessel was sunk by an iceberg — was not filmed on location. A few shots of the real shipwreck do appear at the beginning and end of the movie, but bringing in giant replicas — not to mention hundreds of extras — to the middle of the ocean was too ambitious of an idea even for the perfectionist director.