If you build the inside as dream and choose any wool to build the outside, to dream of making a Cruise Ship, then command up a box then fill it with water or command a waterbox to fill it instead, then TNT it to make a hole on the inside or TNT by putting sand on TNT to explode underwater, also, make holes in the cockpit and rooms with windows to fill it so no breathing pockets while the Titannic is sinking also, put some boats to escape the sinking.
I built a titanic in minecraft and it looked like a house but I liked it but I put perpelers on it and an inside I even made an iceberg too ! And levers and a boat deck.
