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In page Centralia mine fire:

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Bridy, following the engineering team plan, began by digging on the northern perimeter of the dump pit rim and excavated about 200 ft (61 m) outward to expand the perimeter. However, the project was ultimately ineffective due to multiple factors. Intentional breaching of the subterranean mine chambers allowed large amounts of oxygen to rush in, greatly worsening the fire. Steve Kisela, a bulldozer operator in Bridy's project, said that the project was ineffective because the inrush of air helped the fire to move ahead of the excavation point by the time the section was drilled and blasted.[citation needed] Bridy was also using a 2.5 cu yd (1.9 m3) shovel, which was considered small for the project.[citation needed]