Far below the earth's surface, hydrogen gas is continuously produced through serpentinization. At least some fraction of this hydrogen remains trapped in the deep continental crust; indeed, Soviet geologists found that mud from the Kola Superdeep Borehole was "boiling" with hydrogen.
- Are the Kola Borehole results unusual? (That is, would an equally deep borehole somewhere else find just as much hydrogen?)
- If not, why is no one trying to mine this hydrogen and use it for, say, producing energy or powering cars? Is it "just" a matter of economic infeasibility – for example, due to the extremely deep borehole required?