Two miles into the earth, nine Appalachian miners struggle to survive after a methane explosion leaves them with one hour of oxygen. Two miles into the earth, nine Appalachian miners struggle to survive after a methane explosion leaves them with one hour of oxygen. A methane explosion leaves a group of miners trapped two miles deep into the earth with a small oxygen supply and desperate for any means of survival. Nine miners struggle to survive and try to find a way to escape after a methane blast traps them leaving them with just one hour of oxygen.