titanic theory

Forgive me... but most of my Titanic knowledge comes from the movie. I am hoping the broad technical strokes presented in the movie are somewhat accurate. The movie is also what spawned this question and theory when I first saw it in the 90's. I never really had an avenue to post my theory...

The 1997 movie depicts it a way that everyone knows and use, but with new theories and especially Titanic: Honor and Glory's development videos, I wanna know how was Titanic's final plunge like, with all details and timeline accurately and up to date, so I can know, I'm new to the Titanic...