The Themopylae Server is a term attributed to the data/AI matrix created within the cyber-reality of Satellite 117 that orbits Arcturus. It houses vast stores of data, and in the times when the S-IV Program's support AI's are not helping their Spartan partners, it is the virtual home of said AI's. Many times the AI's will segregate off certain sections of the Server to serve as their own personal area, and craft it into an environment that they like; for example, Baphomet's quarters will usually be some combination of darkness, lava, and occult-like environs.