This is the nest of the mature colony, and there's the nest entrance.

Hole

It also looks very similar to some of the cave dwellings of the Hopi people that are in that area.

Natural excavations

Q.E.D.

And when we dig up nests we find they're about as deep as the colony is wide, so about a meter deep for the big old nests.

Where is the grave?

and laboriously knock holes through the bottom of it?

The Non Smoking Gun

And this particular cave was Lechuguilla, and this cave is incredibly toxic to humans.

And what that is, is cavitation.

There's burrowing birds.

walkways, caves, crevasses.

What about the Cavern?

What a cave!

Into their lairs.

Ali Baba's cave.

Humans can dig holes and make a well.

Yes, as a matter of fact.

I made it into a kind of chisel.

Aven Cave Surveying Tool

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Tunnel Cave Drawing Software

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Nothing ventured, nothing gained.

One may only catch the tiger cub by entering the tiger's den.

Help me build the cave instead.

In ant hills.

Redant hills.

This case is justified.

Come on, let's go.

break the boards!

And the nest maintenance workers do that inside the nest, and then they come out of the nest carrying bits of dry soil in their mandibles.

A Breach in the Eurozone Dike

Out of what cave

You can make yourself believe anything.

And uproot the lair from its grounds.

Try bathing your temples.

It's a priest hole.

They used to hew dwellings in the mountains to live in security.

And dwellings hewed out of mountains ingeniously?

And they used to carve dwellings in the hills, without fear.

And you carve out dwellings in the mountains, with skill?

They were hewing the mountains into houses, therein dwelling securely

Will you still skilfully hew houses out of the mountains?