Ambient Mode, day 44, vanilla game no mods, Extreme Combat turned ON
around 20:00 on day 43 i've found a gray boar beyond the fence around the array. After i ran back to base, found three blips on the radar two of which are gray boars as well.
Not sure if that's a bug or not, but as far as i understand they spawn in as part of a story mode event, they are also the only story mode event that appeared in this save.
However, before that (not sure on which days, probably around 10-15) three random events also went down - the superfog, the warp dart on top of the tower, and the empty base
All behaved like normal events - no ability to save, pause menu didn't pause the game, in case of the empty base pause menu didn't open at all.