The mineflooding happed during construction of the air shaft in Qidong Coal mine.
祁东煤矿风井在建井过程中,发生钻井井壁突水事故,井筒被淹。
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According to state media, water started flooding into the mine a week ago Sunday at 1:40 p. m. after the wall in an adjacent abandoned mine shaft was breached while 261 miners were underground.
The cave-in is believed to have been brought on by flooding in the mine in the city of Hegang, which is around 300-kilometers northeast of the provincial capital Harbin, near the border with Russia.