Ulster Queen was the second of three new car ferries delivered to Coast Lines in 1966/67 to update the Irish Sea services of the Belfast Steamship Company.

The smaller, third new ferry, Lion took over the Ardrossan - Belfast day service of Burns & Laird.

Ulster Queen saw further service as Med Sea, Al Kahera and Ala-Eddin.

In 1988, she was bought by Hellenic Mediterranean Lines, and renamed Poseidonia.

The following day, she sank on Hyndman Reef, Safaga and lies as a wreck.