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Elias realized then what the "GM" in the filename stood for: . He wasn't downloading a file; he was opening a door that only opened from one side.

The file GM_PQLMAMJ_TNK_R5.zip was never supposed to exist on a public server. It sat in a hidden directory of a decommissioned satellite uplink station, its name a cryptic string of characters that looked like a digital sneeze. The Discovery Download File GM_PQLMAMJ_TNK_R5.zip

His monitors flickered, displaying brief frames of what looked like topographical maps of the moon. Elias realized then what the "GM" in the filename stood for: