A timeline of key events in the Sago Mine explosion: Jan. 2:
—An early morning explosion traps 13 miners underground, but rescuers cannot enter for nearly 12 hours because dangerous levels of carbon monoxide are being vented.
—Rescue crews finally enter the mine on foot for fear of sparking another explosion.
—The federal Mine Safety and Health Administration sends in a rescue robot, but it's abandoned after getting stuck in the mud.
Jan. 3:
—Rescuers keep pushing deeper into the mine shaft.
—A mine executive is "very discouraged" by air quality tests, which show carbon monoxide levels measured 1,300 parts per million, exceeding the maximum safe level of 400 parts per million.
—Gov. Joe Manchin says it will take a miracle to find the missing miners alive.
—One body is discovered in the mine. The prospects of finding anyone alive appear increasingly bleak with no signs of life.
—Shortly before midnight, family members say they have been told that the other 12 miners are alive, 41 hours after the explosion.
—One miner is in critical condition at a hospital, and was "unconscious but moaning" when he was brought to St. Joseph's Hospital, a doctor says.
Jan 4:
—Three hours after word the miners had survived, the mine company's CEO makes a stunning announcement that news of 12 survivors was wrong. Just one person survived, he says, explaining the wrong information was a miscommunication between rescuers and the command center overseeing rescue efforts.
—Chaos and fights break out in the church where the families had gathered to wait, says John Groves, whose brother Jerry Groves was trapped in the mine.
