Three workers were killed and six others were injured when a coal mine was flooded in the northern province of Quang Ninh on Monday.
A report in Tuoi Tre Tuesday quoted Nguyen Truong Giang, director of Uong Bi Coal Factory, as saying that nine workers were drilling to explore a 1,000 meter deep mine shaft in Uong Bi Town when the accident happened.
A water bag exploded, trapping five workers, while others managed to escape, Giang said.
Later that same day rescuers recovered the victims, three of which had already died.
The survivors were rushed to the Vietnam Sweden Hospital with multiple injuries, according to the report, adding that two of them remained in critical condition.
Water bags form on the surface or underground during the formation of coal beds, or during mining.
Usually each bag's volume is between ten and 20 cubic meters, or even more, while a mine shaft's entrance is just between five and ten meters wide. The explosion of bags can cause cave-ins, blocking the entrance and trapping people inside, experts said.
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