After I was watching a vid, in which a guy showed hidden things in files, I wanted to share the findings with you. Credit for finding goes to youtuber "wiliextreme".
As you can see, there is a strange asteroid too, suggesting space could be accessible, or there was a beta drug mission involving those. I know he may have accidentally modded them into the game with another mod.
EDIT
Forgot to mention MrFunreal claimed to find the egg in files.