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I don't know if this is the same thing or not, but I read a story once about an early trapper who would dig a hole build a fire in it and sit over it cross legged. He would then wrap his blanket around him trapping the heat and staying warm he was also able to keep an eye on his surroundings. Obvoisly not a big fire and I bet he smelled kinda smokey lm the morning but he was traveling fast no time for a shelter and didn't want to give his position away with fire light. Always wondered if that would work but I have never tried it. Anyone heard of it or tried it??
I have built several and used them more often, but the time it takes to dig the two "wells" and connect them at the bottom makes it more sutable to a long-term camp than a weekend.
The fire they generate is fierce - good for heating large volumes of water, for example. They melt glass nicely.
Good at protecting fire from the wind.
Poor for warming you since the fire is in the bottom of one of the holes, limiting radiant heating.
Not very good in heavy rain or if the water table is high.
Never tried one with lots of snow on the ground, but seems doubtful for such conditions.
They generate smoke according to the fuel used.
(Whatever you do, don't use batoning to prepare the wood.)