Two miners were attempting to access a plugged grizzly screen by excavating a slot cut trench when the trench walls collapsed, engulfing the miners. During an initial rescue attempt, the walls collapsed further, trapping two additional miners. The material was waist high on three of the miners and was over the shoulders on the fourth miner. After several intense hours of rescue efforts, all four were freed from the debris and flown to a nearby hospital. The accident occurred on June 29, 2017.