Menachite Mountain (Earth-5875)

The Menachite Mountain was a massive mountain, in the Highland Mountains, at Csongrád, on Reach. Beneath it lied the secret Castle Base, a facility of the Office of Naval Intelligence, as well as a buried forerunner Menachite Complex, which guarded a crystal.

History
Dr. Catherine Halsey and Colonel James Ackerson had a personal office within Castle Base, beneath the Menachite Mountain. Some of the training undertaken by the SPARTAN-IIs occured within their base, allowing them to grow tirelessly familiar with the territory.

During the Fall of Reach, the base served as the fallback position for Red Team's Delta division, consisting of William-043, Vinh-030, and Isaac-039. The trio was then joined by Fred-104 and Kelly-087, who later discovered Dr. Halsey, who had remained operative under Operation WHITE GLOVE. Her directives were to destroy the base and prevent the Covenant from acquiring technologies being developed by the UNSC.

The Covenant eventually located the base and attempted to invade it, forcing Halsey to activate WHITE GLOVE, leading to Castle Base's destruction and the deactivation of her Auton synthetic Kalmiya, stopping the Covenant from acquiring vital UNSC data. Halsey and the SPARTAN-IIs then retreated to the dangerous titanium mines found below the mountain, eventually encountering a mysterious complex.