It's amazing just how much GTA Online has evolved into its own game over the years, and a lot of that has to do with the PC modding community. Team Guru, a group of said modders have apparently been digging through the game's files since the launch of the Gunrunning update, previously discovering some hints within the code that points to some Alien-themed content buried within. Recently, the group posted a new YouTube video which shows them successfully activating the mission.
Here's the video:
The mission itself is relatively bland, as it involves not much more than traveling to the location, picking up a supply drop, shooting a handful of aliens, and driving back, with most of the time spent traveling to the location. Given Rockstar's extensive history with polished mission design, it's highly likely that the mission could be in some sort of preliminary planning phase, still being worked on behind the scenes.
It feels rather incomplete compared to most GTA missions, so it's quite possible that Rockstar didn't plan for the mission to be uncovered. Then again, maybe they did.
Source: [YouTube via Kotaku AU via Gamespot]
