blevy. >> the fire burns itself out. the disaster zone isn't safe for more than a month. >> over the next 36 days, we were still on scene because there were thousands of 100 pound cylinders that could have been damaged once you start to move them, they could explode. >> one employee is killed in the fire and a fire fighter dies of a heart attack. the enormous inferno leaves its mark on canada's largest city. >> this was a six alarm fire in toronto and we've had six alarm fires for high rise buildings, factories and other things like that. this was certainly a significant event because it wasn't just the fire. it was the exploding as well. >> coming up -- >> stand back, stand back. we just had a huge explosion. >> a mystery train in flames, unleashes a toxic cloud. >> i haven't seen flames or smoke of that kind before. >> firefighters get too close to