What didn't make sense to me (among other things)
There were many things with the film that didn't make sense, of course, for various reasons. However, one thing i kept thinking was why didn't one of the characters say something to the effect of "we're going to raise the Titanic to get a small load of byzanium and when we use up all of that byzanium, then what? we'll be fresh out of Titanics."
i don't know if i missed something that stated that the byzanium lasts forever and it never needs to be replenished. an inexhaustible source of energy would be a valid reason to spend an exuberant amount of money to raise the Titanic.
http://www.youtube.com/watch?v=1_BbtXj2P4g