The museum tells the stories of those who lived and worked on the ship during and post- World War II. The ship has 9 decks.
Belfast was launched on St. Patrick's Day in 1938 at the Harland & Wolff Shipyard in Belfast. It played an important role in Britain's various wars. During World War II, it intercepted the German passenger ship Cap Norte, an enemy merchant ship attempting to return to Germany.
In 1939 the ship was hit by a landmine and 21 crew members were injured at once. The damage was extensive and significant, and it took three years to repair it.
In 1942, when the ship returned to service, it was renovated and made more efficient. A new radar system and fire control were installed. These improvements added considerable weight to the ship, which now weighed 11,553 tons. It was Britain's heaviest battlecruiser.
The ship participated took part in battles, operations and the Korean War. In 1952 it was hit by a missile, which resulted in the death of a soldier and the injury of four other soldiers.
Between 1959 and 1962 it was used during training and instances of demonstration of power. It completed its military service in 1963, and became a floating museum opened to the public in 1971.