Why did they have to go to the bow thrusters? Because modern ship's props are electrically driven - there wasn't any internal 'propeller shaft' to go to. The power is generated by a number of giant diesel engines called "prime movers," similar to how diesel locomotives do it - and one of them actually kills a character falling through the ship's flooring: Lucky Larry.
Creator Killer: For Wolfgang Petersen. He hasn't directed anything since despite his track record before it. The irony is the movie was far from a bomb - it made a profit in the theaters and a fairly tidy one after DVD sales were factored in.