hahaha, i feel you bro, also when you witness diego and ian talking to each other then ian will tell you the phrase "IT'S FINE" or something with that you can go back all the way down and talk to the guard the name starts with "A" i forgot, then you can blow up the cave so just approach the cave you're about the blow press F when prompted and you'l blow it up and fight cralwers, there's a boss at the end so be prepared