Some very famous shipwrecks include the RMS "Titanic", HMHS "Britannic", RMS "Lusitania", SS "Andrea Doria", SS "Edmund Fitzgerald" or the "Costa Concordia". There are also thousands of wrecks that were not lost at sea but have been abandoned or sunk. These abandoned, or derelict ships are typically smaller craft, such as fishing vessels. They sometimes pose a hazard to navigation. 