Roger Long (1680 – 16 December 1770) was an English astronomer, and Master of Pembroke College, Cambridge between 1733 and 1770. (wikipedia)
I'm not claiming to have solved the puzzle of the Titanic. I'm just saying the preponderance of the evidence points toward that low-level break. And it's a big preponderance.
She was doomed, she was flooding and she was going down, but she had reached a point where there was an illusion that she would float a longer period. People were inside, not panicked, and suddenly the hull cracked.
It is not so much a matter of saying that this IS what happened but that this is the story that the pieces documented by The History Channel 2005 Expedition tell when put together with the body of knowledge accumulated previously.
The breakup was not just something that happened as the ship made her final plunge, but the breakup began the final plunge.
