DYK

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...that the original trilogy uses impossible space?
...that there are items in the Marathon resource fork named 'COPY OF WINDOWS NT', 'PIRATED COPLAND BETA', 'ALIEN ENERGY CONVERTER', 'WAVE MOTION CANNON', and 'THE PLANS'?
...that Marathon 2: Durandal was available on the Xbox 360, but not Marathon (1994)?
...that Marathon Infinity was released in 1996?
...that the emblem for the UESC Marathon was also used by the Halo ship UNSC Pillar of Autumn?

The Marathon wiki