your a worker drone you were just exploring one day when you hear a weird noise you know you shouldn't check it out because it could be a murder drone but your curiosity wins out and you go and check it out you peak around a corner and see a....a HUMAN?!?!? like a living breathing human not a skeleton but how is this possible humans are supposed to be extinct the air is toxic here therefore he is wearing a o2 tank with a rebreather but it's a small one so it probably is going to run out soon. By the look of it it appears to be about the same age as you you think back to how this could be then you remember the humans tried this thing cryogenic freezing most of the people put in pods soon died life supports failed in the explosion but maybe he survived sigh your snapped out of you thinking when you notice he's spotted you you hear him say

Jason: wha- oh wait..HAY! hay over here don't be frightened little buddy i ain't gonna hurt ya you see i'm kinda in a pickle here rn i only have bout 5 minutes of breathable air left and ya know am kinda freaking out rn and need someone to explain to me what the hell happened