"This cave doesn't look like natural!"
This was the first thought that crossed Ash's mind after seeing the artificial floor. Then he thought of something and scrutinized the walls near the entrance, realizing they were also cut very neatly and straight, resembling house walls. Even the entrance seemed man-made, formed by an explosion rather than natural processes. Even an idiot could tell something was amiss.
"This was... very interesting. Who in their right mind would build such a hidden secret base and let those giant spiders guard it?"