I explored past the Refinery and came across a cave with a bunch of diamonds or some sort of crystals in the walls.. It looked awesome and I was extremely excited to see what else I could unfold but then the enemies were not affected by my shots. I left and returned to see if it was a glitch but they are just not taking damage. Decided to abandon it because I was risking death. Does anyone know if this is a bug or if there is anything past this that they have explored?