Why does a huge ship not sink in water?
Why does a huge ship not sink in water? A ship which has a large weight displace a large volume (thus large weight) of water. Hence the buoyancy force acting on the ship is much greater than the weight of the ship itself, making it to float on water. Thus ship do not sink in water.
Will a sinking ship pull you?
However, even with a ship the size of Titanic, the suction created will be so minimal that the only way it would affect you is if you were clinging to her as she sank, allowed her to pull you under for a while, and THEN started swimming for the surface. Cameron's film was accurate on this regard.