how to do it

In a cave there green crystals you need them to make second radioactive waste or just find another one on another safe and put it into mail box and save and join your main and in mail box there will be second radioactive waste to make second omega kerfur but if you want normal kerfur just buy it in a store

I'm gonna prevent you going insane, do not worry about getting out of the cave, when it's time to sleep, just let it happen