There was one "crucial historical fact" Cameron chose to omit from the film – the SS Californian was close to the Titanic the night she sank but had turned off its radio for the night, did not hear her crew's SOS calls, and did not respond to their distress flares. "Yes, the [SS] Californian. That wasn't a compromise to mainstream filmmaking. That was really more about emphasis, creating an emotional truth to the film," stated Cameron. He said there were aspects of retelling the sinking that seemed important in pre- and post-production, but turned out to be less important as the film evolved. "The story of the Californian was in there; we even shot a scene of them switching off their Marconi radio set," said Cameron. "But I took it out. It was a clean cut, because it focuses you back onto that world. If Titanic is powerful as a metaphor, as a microcosm, for the end of the world in a sense, then that world must be self-contained."
