Definitely Not Natural

Now it was quite obvious to this man that he was inside no ordinary cave. He discovered what looked like a room that someone had carved out of the soil and noticed that they were spread around the entire cave network. He had clearly stumbled across something big and it looked like this place hasn’t had any visitors since a few decades now, maybe centuries. He was sure that this was a precious archeological discovery. But little did he know he was right in more way than he could have imagined.