Phil, I'm not sure exactly how they did it, TBH.
In fact, for all I know, that video could be a very elaborate fake. It's kind of hard to discuss any part of it, since it's origins are unknown. I'm really not sure exactly how one would get a camera in there and be able to (safely) view the combustion dynamics first hand, myself, nor am I sure how a camera could withstand the violent combustion waves and heat generated therein.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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