When I managed to stay awake one time they were showing a programme from the wreck site of Titan...
Titani..
THAT ship, they showed how many wooden artifacts had been preserved (one suspects they were mahogany)..
IF the grand staircase was pure mahogany it might well be partially intact if it survived the sinking.
TITANIC: The ship of dreams... But only because it's so dull it makes you fall asleep first