The Trafalgar-class carrier was a class of command carriers (informally known by the public and media as 'supercarriers') operated by the UNSC Navy between 2547 and 2604. Five ships were constructed, UNSC Trafalgar, UNSC Vanguard, UNSC Intrepid, UNSC Fortitude and UNSC Endeavour. At 4,120m in length and displacing nearly nineteen million tons, vessels of the class were the largest ships ever commissioned by the UNSC Navy, as well as the largest self-propelled human-made objects ever built. Construction of each ship took place above Reach in the Epsilon Eridani system, where their sheer size necessitated their construction be staggered over several years at various berths in orbit. Construction was slowed after New Carthage, an industrial colony supplying additional components, was glassed