That's a big cavern they're mining, and maybe not the only one.

The other three advanced behind the workstations on the floor of the big cavern.

Across the big cavern and then the exit loomed before him.

For what lay beyond the big cavern was most of Thorin.

You've got to go back to the biggest caverns again and look around some more.

"Another big cavern just like the one you're so excited about."

And we can't get to the other side without going through the big cavern.

She couldn't make out anything of what was being said, out there in the big cavern.

One to a cavern big enough for us to put hydroponics.

It's one of the biggest caverns in the entire country, maybe the whole world.