Now, after some hours (and dying a long way) spend in caves, I slowly wonder if there's any mayor collective of survivors. Like in mid-layer stumble on village or small city full of survivors (or even whole layer, small layer, dedicated to survivors) to trade or take rest before continue onward. If there's send out thousands of Expies on that planet, surely there's a collective out there (or at least explained why such thing won't work).
I find out a note about trying to leave to surface.
I will put it here:
"I met up with someone, we agreed to try to out to the surface through one of those holes to outside. My friend stepped out first, and immediately they started stumbling in shock. They seemed to be in a lot of pain. They vomited a bunch, then collapsed and stopped breathing soon after. They skin started blistering too, specially around the head and neck. Something is preventing us from leaving. Im scared."
Welp those chips aren't just for health check-ups. I will call this note "Trying to Leave". Whatever I find interesting like lore vise (like this note) I will put here as another reply. At least we got the answer why they won't get out from here.