this particular balloon was filled with flammable gas t was supposed to be filled with helium but when the fire department gave a statement, they said some of the merchants in brazil use flammable gas, because it is cheaper. >> p the hin den berg enterprises that did this. >> they do it to cut costs. >> you are kidding me. they are putti kids in dangers. >> where do you get balloons? for a birthday and you have a bunch of candles. >> he was rubbing it up against the carpet. that could have helped the explosion occur. as soon as the balloon lit fire, he ran out. he got burned pretty badly. he was running to get help. his mom just happened to put video cameras in the home. so they have proof as to what happened. >> look at that. oh, boy, the boy's ankle and foot. >> and on that video, they would have no proof as to what caused it. they are aware that merchants are doing this in brazil and hopefully they will be able to put a stop to it pretty soon. >> it wasn't two weeks when you guys posed me the question, would you go swimming with shark? i said, yes, after i was in a shark cage. after

investigators believed the blast was caused by a spark that ignited methane gas that had built up due to inadeq highly flammablexplosion. conditions should never have existed for that to take place. stewart was there when some of the 29 miners he worked side by side with for decades were brought to the surface. >> what kind of condition were they in? >> their faces were very black. and it smelled like -- like, smelled like, dynamite. i'll never forget that smell. >> the miners ranged in age from 20 to 61. most were fathers. a third were killed instantly. robert atkins, a former coal miner and wife shareen lost son jason at the end of his shift heading toward the mine entrance when he was overcome by toxic fuels. >> the coal dust was so bad it carried, ignited, away and took our son's life who was almost out of the mines. >> reporter: gary quarrels, third generation coal miner lost his only child gary wayne who left behind two children. >> they live up beside us. at times we thought that wasn't a good thing for that to be like that. and then after he -- -- after he got killed i said that's, that was a good thing