going underground

Hughes credits “going underground” for seven years with allowing her to get to a good place emotionally and spiritually.

The horses were grouped in the brush, leaving some men who were going underground like gophers out near the entrance.

It is a curious experience—this going underground for the first time.

"You can't tell how you're going—underground," retorted Doris.

With his stomach throttling his throat, Lee asked, "How deep are we going underground?"

We're going underground, into a veritable warren of these spider creatures.