The ship was also built for safety. It had 11 watertight compartments. These are special dividers in a ship to keep water in one place. If two of them were filled, the ship would not sink. "Andrea Doria" also had very advanced radar. Radar could warn the captain of the Andrea Doria if there was something in the path of the ship. However one big problem was that the ship often tilted too much to one side.