In Titanic, the iconic ending shows Jack letting go of the plank and allowing himself to sink and die while presumably leaving Rose alive and safe. I find it controversial that Jack could have climbed on to the plank, and they both could have managed to save themselves still.
I have put forward a theory popular on this topic. But am certain there are much more explanations for this plot. Could it be an inconsistency? Or was it played up just because Jack had to die?