Steven:
Yes, it would suck to be the bloke who caused all of that damage....and while I do understand your point and what you're trying to get at, there is quite a big difference between that, and the side of the Titanic's hull which was subject to the heat from the fire for a matter of days - so it was a constant heat, not just something which was started and was then quickly extinguished.
Michael:
The documentary does go back a while. I couldn't tell you what it's called now but I do recall that it was available on VHS, so that gives you an idea of the time it was around.
However, it definitely did have mention of the smouldering fire in connection with the brittle steel from the hull.....
Jim:
Thanks for the comments.
The thing with the hull is that it would have maintained a warm temperature during the time the fire was burning, and that was for some time, and then when it was extinguished, it would have been cooled down again - a lot quicker than it was heated up. Anyone, anywhere, can tell you, and probably from experience before as I mentioned with the car windscreen comparison, that sudden changes in temperature or changes after an extended period of one particular temperature, can cause cracking or weakening in the material. All it needs is a trigger - in the Titanic's case, the iceberg.
What could ultimately solve the question is if tests were done on the steel from the area the fire was burning, and then compared to a sample from the exact opposite side of the ship, to see what, if any differences there are. Until something like that is done, it all just has to remain conjecture unfortunately.