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Digging a little deeper, the temperatures quickly rise. Here the demonstration is placing straw into a pit that is about 2 feet deep. As soon as the straw is placed down there, it catches on fire. Also, to demonstrate the heat, there is a pipe that is dug into the ground where water was poured down it, and 3 seconds later a geyser of steam erupted 20 feet into the air. I do not have a picture of this, but do have the video which I will post later.