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Thermopylae-class supercarrier
Production information
Naval architect:	Dr Robert McLees
Manufacturer:	Reyes-McLees Corporation
Role:	Flagship Engaging enemy fleets Heavy carrier and troop transport
Class before:	Punic-class supercarrier
Hull classification symbol:	CVB: supercarrier
Technical specifications
Power plant:	4 XM-9 Helios fusion reactors M8192 backup fusion reactors
Engine(s):	6 Diamond Series-4/SH primary fusion drives
Slipspace drive:	APEX-3 SFTE (CODEN-IV)
Hull:	2-3.5 meters of titanium-A1 battleplate
Armament:	2 Series-4 812SHR2 MACs 2 quad 37A4F7 naval coilguns 160 pods of M58 Archer missile 40 pods of M4020 Bident missiles 40 twin M66 Sentry 279mm/36 cal naval autocannons 25 quad M910 Rampart 105mm/45 cal point defense guns 30 M810 Helix 35mm/99 cal point defense guns
Complement:	11,890 sailors
Chronological and affiliation
Building range:	2514-2528
Service range:	2518-2544
Affiliation:	UNSC Navy

The Thermopylae-class supercarrier is a heavy command and coordination carrier utilized by the UNSC Navy during the Human-Covenant War. Beginning production in 2507, the Thermopylae is the largest, most powerful and most durable warship ever built by the Reyes-McLees Corporation. Possessing an intimidating profile, the Thermopylae was built as a response to the heaviest Covenant capital ships, whose firepower easily outmatched even the most powerful UNSC ships. Equipped with two super-Magnetic Accelerator Cannons flanked by two rapid-fire frigate MACs, thousands of missiles and hundreds of individual turrets, these warships were the most powerful ever fielded by the UNSC Navy at the time. Despite this, Thermopylae is outmassed by the older Punic-class supercarriers and thus cannot carry as many ground troops or fighters, but it proved far more useful as a command ship for deep strikes into unknown Covenant territory.