After almost four years of digging, theorizing and discussing discoveries, the GTA Online community has finally cracked the so-called Mount Chiliad Mystery, and the result is... rather disappointing, actually.
The culmination of all the conspiracy theories and extremely far-out concepts is a single, short, not particularly interesting mission involving the same aliens as the ones Michael encounters during a drug-induced hallucinatory trip.
The mission was first discovered by data miners and although there is also a way to legitimately trigger the mission through proper gameplay, the requirements don't exactly seem worth it. You'll have to put in a lot of effort, and more importantly, time, into unlocking this easter egg, and it might end up feeling anticlimactic.
Basically, you'll need to run 601 Gunrunning sell missions. Yes, 601. That's a lot of sell missions, and no one will hit that number for several weeks, if not months, legitimately. Some players place the average time for a sell mission to be 5-10 minutes. Even counting with 5, that makes over 50 hours.
The payoff for all that work and effort? If you pull off 601 sell missions and then initiate a supply mission at some point between 21:00 and 23:00 (in-game time, mind), a new kind of supply mission will trigger. You'll be tasked with stealing alien eggs from a downed UFO, which is logically guarded by armed aliens who aren't too hot on the idea of you using their unhatched offspring to fuel your criminal activities.
