Update: I adjusted my brightness setting, so at least I can see, it just feels like something is broken.

Also, I am stuck on "explore the cave" after crossing the bridge, Iv'e visited every spot I can get to without dying (including the ravine under the bridge). Am I missing something really obvious?

Update update: I walked far enough away from my vehicle to get the "new spawn point: crashed ship" message, and after that my lights started working underground

Also, I eventually found my way through. It turns out, the map actually changes based on what checkpoints you hit. I accidentally went the wrong way to explore the drill site underground, and I found a cave that was a dead end. After visiting the drill site, is said "explore cave". Well, I already knew one path was a dead end so I spent about 30 minutes walking in circles trying to find any other way. Eventually I check that path again and WHAT DO YOU KNOW. It magically opened up in a completely different shape than when I went down it last.

At least by doing all that exploring I knew exactly how to get out after I needed to go back to the surface, but boy, was that really confusing to try and figure out where to go.