They can only spend about 20 or 30 minutes before they run...
They can only spend about 20 or 30 minutes before they run into pockets of carbon monoxide. It takes such a toll they have to come out and rest for about an hour.
They can only spend about 20 or 30 minutes before they run into pockets of carbon monoxide. It takes such a toll they have to come out and rest for about an hour.