CHARLESTON, W.Va.
A West Virginia company is working on a piece of equipment designed to keep miners safer.
Trinity Resources demonstrated its a mobile mine safety chamber this week at the West Virginia Mining Symposium in Charleston.
The company headquartered in Putnam County has been working on the project for about three years.
The device resembles a big steel box on bulldozer tracks and is designed to keep underground miners safe in the event of an explosion or collapse.
The Daily Mail reports that the aptly named Guardian Angel contains enough oxygen to keep 15 miners alive for up to four days. Food, first aid gear and water also can be placed under the floor panels in the chamber. And it's also equipped with a toilet.