Red tape and bureaucracy are the most frequently given reasons for people working underground.

They also began working underground, strengthening the foundation of the building.

The men were working underground when mesh used to reinforced a rock wall gave way.

He knows how to set up independent cells that work underground.

At the time up to 500 men were working underground on the night shift with more than half in the affected areas.

It'll be easier to work underground in this weather anyway.

Company officials said the miners who died were working about 1,000 feet underground when the explosion occurred.

In the dark of the year I can manage to work underground.

Women's resistance to the regime still has to work underground.

How long would these men keep him here, working underground for them?