A desperate search is underway Sunday for a miner who went missing after a set of mines flooded in West Virginia over the weekend, officials said.

A crew operating at the Rolling Thunder Mine in Nicholas County hit an unknown pocket of water Saturday afternoon, causing the tunnels to flood , county commissioner Garrett Cole said in a statement.

All but one miner, who has yet to be publicly identified, have been safely located, with rescue workers believing that the missing worker is trapped somewhere three-quarters of a mile beneath the mountain.

West Virginia’s mining industry has been hit with two major incidents in less than a week. Getty Images

Rescue crews have been manning the pump since 9:30 p.m. on Saturday, with Cole still unsure as to how much water remains in the floode

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