Thats true, but the TITANIC was a flawed designed as well. The Watertight compartments only extended to 'E' Deck and not all the way up the ship. The result was that as the damaged compartments flooded the water, they spilled over into the next compartment which in turn began to flood. A basic domino effect. Had they designed the ship correctly the ship would have survived mostly likely survived..
Why Andrews (the deseigner) didnt forseethis rather obvious error we will never know, he went down with his ship.