The investigation report of "6· 10/0" major flooding accident in Shanxi was released. What is the main cause of the tragedy?

The direct cause of the accident is: illegal exploitation of the safety pillar below the main flood ditch led to the collapse of the main flood ditch, and rainwater runoff entered the goaf along the collapse pit, which merged with the accumulated water in the goaf that was not completely treated. The accumulated water increased rapidly, and the water pressure increased, breaking through the soft rock stratum between the horizontal mining face of 13 100 m and the goaf of 1320m, resulting in a water seepage accident.