RMS Queen Mary was known as the “Grey Ghost” during its World War II troopship service.
The liner was painted gray and converted for military transport after Britain entered World War II. Her speed and zigzagging course made her difficult for German submarines to intercept, helping her carry large numbers of troops across dangerous waters. The nickname “Grey Ghost” reflected both her appearance and her elusive wartime role.
Queen Mary’s speed was a crucial defensive advantage. She could outrun some submarine threats rather than relying only on escorts, although her voyages still required careful navigation and military planning. The conversion removed much of the luxury associated with her peacetime service.
The nickname is sometimes mistakenly applied to other gray-painted wartime ships. In ocean-liner history, “Grey Ghost” is particularly associated with Queen Mary’s World War II troopship career.