Which hazard has occurred when you are working in a grain bin and you stand on or below the "bridged" grain, causing it to collapse and bury you?

Suffocation is a most leading reason of death in grain storage bins. Grain handling industry is a high hazard industry where workers can be exposed to numerous serious and life threatening hazards. These hazards include: fires and explosions from grain dust accumulation, suffocation from engulfment and entrapment in grain bins, falls from heights and crushing injuries and amputations from grain handling equipment.