Abstract: At approximately 11:30 a.m. on December 21, 1997, Employees #1 and #2, both volunteer firefighters, were helping to extinguish a blaze in a 70 ft tall by 20 ft diameter silo. They were on top of the structure, hosing the flames inside, and thought the fire was extinguished as coworkers removed a bottom panel of the silo to dispense the 10,000 gallons of water they had pumped into it. When the panel was removed, a back draft occurred, followed by an explosion. Employee #1 fell 30 ft into the silo and was trapped inside for between 45 and 60 minutes. He suffered second-degree burns on his face and hands. Employee #2 was thrown approximately 35 ft into the air and crashed through the tin roof of a trailer that was about two-thirds full with sawdust. He sustained an injury to his right knee and a separated right shoulder.