While a lot of thought and science went behind this, it's still conjecture, but a very cool animation on what possibly happened as it went down. The rush of water when it hit the bottom was very interesting.
http://www.theblaze.com/stories/incredible-new-animation-reveals-how-titanic-hit-floundered-and-landed-on-ocean-floor/
http://www.theblaze.com/stories/incredible-new-animation-reveals-how-titanic-hit-floundered-and-landed-on-ocean-floor/