40,000 BCE
From Halopedia, the Halo wiki
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Circa 40,000 BCE, an unidentified alien vessel crash-landed in Sector 1215 of Installation 04. Sometime prior to the crash, the ship started broadcasting a distress signal repeating every 72.83 seconds.[1][2] After attempting to translate it, 343 Guilty Spark blocked the signal, as no communication revealing the location of any of the Halos was allowed.[1]
Sources
- ^ a b Halo: Combat Evolved Anniversary, Terminal 5
- ^ Halo: Combat Evolved Anniversary, Terminal 6 ("I have now endured 60,000 years without word from outside the Array.")
