The river goes underground, just past where they were lost.

David told his mother he was going underground for a few days.

Two of their close friends went underground during this period.

Because the very nature of disease has changed since we all went underground.

She was therefore required to go underground with her political work.

He went underground one day and was missing for almost a week.

About half of all sets were taken, the rest went underground.

However, the Project had simply taken advantage of this to go underground.

You'll make it go underground, and that's the last thing you want.

The men are in much better spirits since they went underground.

"Maybe we can use them to find out where he's gone to ground."

If he did, they had to go to ground, and do it for a month, at least.

They had to find a place to go to ground.

Now you'd best go to ground soon and keep in cover.

They went to ground and so far those in charge of the matter have not been able to tell where.

Maybe, once they went to ground, he could pick them off.

Eight months of down time might be an appropriate period for someone to go to ground.

The world went white behind his eyes but he would not go to ground.

But they were going to have to go to ground.

I'd give anything to know just where he's gone to ground.