It's about time to show some of the areas as this topic is pretty outdated...
I killed every scriptedpawn in order to not give everything away.
The conveyor belt area.

A mine area as seen in the trailer.

The big cave as seen in a tiny pic.

I had to remake this door texture as well.

Tunelu.

The outside "HUB" area.

The scene from the screenshot that has started it all.

An improvised low-poly cave segment.

Another scene from a screenshot.

The map is going to be chock-full of secrets!

Another scene from a shot.

THE CONVEYOR BELT AREA.

The "strange lamp" area from a screenshot.