A massive search operation is underway in West Virginia, where officials say crews are "working around the clock" and continuing "aggressive" efforts to locate a missing coal miner who became trapped in a flooded coal mine on Saturday afternoon.

"There is nothing that we would spare to try to save the life of the miner," West Virginia Gov. Patrick Morrisey told reporters on Monday.

The miner is the foreman of a 17-person team that struck a pocket of water inside of south-central West Virginia's Rolling Thunder Mine, causing water to rush into the complex, said Nicholas County Commissioner Garret Cole, citing information from the local emergency management and homeland security agency as well as reporting by CBS News affiliate WOWK. Rolling Thunder Mine is in Nicholas County.

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