A short time before the bombs fell a suspicious man hid a wery powerful and danerous experimental weapon that he stole from a powerful American weapon manufacturerin the cave under the Red Rocket truck stop but little did he know that the cave was also used to store radioactive waste and he died before being able to tell anyone what was hidden in the cave so the mysterious experimental weapon might still be there after all this time
You can find the gun the the room where the safe is but be warned it might be a bit hard to find because the Mole rat in the room might have buped into it and cause it to move