Queen Mary was laid down at Palmers Shipbuilding in Jarrow on March 6, 1911, launched a year later, and completed in August 1913 at a cost of just over two million pounds. At 700 feet long and displacing over 31,000 tons at deep load, she was slightly larger than her predecessors of the Lion class. Her eight 13.5-inch guns in four twin turrets could hurl 1,400-pound shells nearly 24,000 yards. She was fast, elegant, and powerful -- the embodiment of the pre-war Royal Navy's confidence that speed and firepower could compensate for lighter armor. The ship was the first battlecruiser to restore officers' quarters to their traditional place in the stern, after complaints from the fleet, and the first to mount a sternwalk. Small comforts for a ship that would spend her entire war in the cold gray waters of the North Sea.

Commissioned on September 4, 1913, under Captain Reginald Hall, Queen Mary joined the 1st Battlecruiser Squadron under Rear Admiral David Beatty. Her first action came at the Battle of Heligoland Bight on August 28, 1914, where Beatty's battlecruisers charged south to rescue British light forces tangling with German cruisers near the German coast. The squadron sank several German light cruisers in a one-sided engagement. In December, Queen Mary attempted to intercept the German force that bombarded Scarborough and other coastal towns, but a 15-mile gap in the British screen and a misinterpreted signal allowed Hipper's ships to escape. A refit in early 1915 meant she missed the Battle of Dogger Bank in January. For the next year, she patrolled the North Sea without seeing action -- a frustrating routine of readiness and waiting.

At Jutland, Queen Mary was part of Beatty's line when the British and German battlecruisers opened fire at 15:48 on May 31. The German gunnery was accurate from the first salvos, and the British ships struggled with range estimation as German vessels blended into the afternoon haze. Queen Mary was engaged by the German battlecruiser Derfflinger. At approximately 16:21, she was struck by two shells that penetrated her hull. The damage was severe but not immediately fatal. Then, at 16:26, a further hit -- likely striking near one of her turrets -- triggered the catastrophe that every battlecruiser crew feared. Flash from the shell penetrated to the magazines below, and the ship's stored propellant detonated. The explosion broke Queen Mary apart. Of her 1,286 crew, 1,266 died -- a loss of life exceeded among individual ship sinkings at Jutland only by the combined toll of the battle itself.

Queen Mary's wreck was discovered in 1991, lying in pieces on the North Sea floor. Some sections rest upside down. The site is designated a protected place under the Protection of Military Remains Act 1986 -- a war grave, legally shielded from salvage or disturbance. The wreck stands as physical evidence of the design philosophy that killed her crew: the conviction that speed and striking power mattered more than the ability to absorb punishment. British propellant charges, stored in silk bags rather than brass cases, burned with terrifying speed when ignited. Flash protection between turrets and magazines was inadequate. These were known risks, raised after earlier engagements, but never addressed in time. Queen Mary, along with Indefatigable and Invincible, paid the price for institutional inertia. The lesson reshaped warship design for a generation -- but for the men of Queen Mary, it came too late.