Megatron hummed, absolutely undaunted by Orion's scolding, though he dipped his helm in acknowledgement.

"Of course. But all of those disappeared because people willed them to. The only thing that has been done so far about this, if the people responsible even know about these deeper parts, is restrict access to the underground in certain places."

Of course, they probably knew. These etchings and the other things Megatron had found down here were probably the explicit reason for the 'forbidden zones' for the 'safety of the pubic'.

But they hadn't tried to destroy this, and it was perfectly possible, as Megatron well knew, to get underground with only a bit of ingenuity and exploring.

You could even end up in places like this by accident.