Hi. Just a idea wondering around my brain today. I live near volcanoes, some have secondary activity (which is used for geothermal exploration), but while the magma is close enough to the surface to create secondary volcanism activity (such has fumaroles), we dont any geyser. After searching the web i came across this video, which looks like simple to accomplish (security first..).. 1) The output of the borehole is simply water vapor? 2) The reaction should be the cold water in contact with a super heated metal pipe? 3) What soil temperature should i search? 4) Length/width of the pipe and which type of metal the pipe should be to accomplish better results? Any help/ideas is appreciated.