If you move forward in the cave you will be able to see eventually. it appears as though you start out inside the wall when you enter the cave, but if you move forward, it goes to normal. But more importantly, how did you beat the game in a day? I've been playing all week and I just made it to The Strip. You must have basically skipped everything and gone straight through the main quests...
I have yet to try what you suggested, but thanks for the reply.
I beat the game in a day thanks to the solo method of going through the main quests. I did not even reach level 20 by the time I got to the final battle, but I was still able to kill everything just fine with the basic weapons (varmint rifle and 10mm pistol). The game was on hardcoe and normal, with under 20hrs on the save slot. I just wanted to get the hardcoe achievement out of the way, mostly...not really a speed run.