Id this stuff because im new at this how you zoom in zoomed out is annoting and how you get the smoke stacks blowing smoke of the titanic
I Have an idea on what those blue lines mark for. That blue line you showed Marks where Titanic Broke in Half! Thats also where it started to break apart.
The blue line is between the 2nd and 3rd funnel. Titanic broke in half between the 3rd and 4th funnel.
That is where the ships strongest piont is according to the james cameron animation