Another held what may have been a breathing mask of some kind.

Somehow he forced himself to step forward far enough to accept the breathing mask.

Perhaps the breathing mask had been low on air.

But my men will be wearing breathing masks and carrying their own air supplies.

A man passed a breathing mask to her; she drew in some of the oxygen.

He still wore the breathing mask over his lower face.

You can spend a few minutes getting used to the breathing mask before we go in.

As he got out he took off his breathing mask.

All I need is a breathing mask and a few supplies.

Then he pulled the breathing mask down around his neck.