There was an article about software tool for documentation of underground cavities ( caves, mines, etc . ) named Therion after ancient Greek word " therion " which means big wild dangerous animal living underground.
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Techniques for detecting caves, tunnels and other underground cavities range from the high-tech to the folkloric _ from, say, mapping the ground with high-frequency radar waves and seismometers to scanning the terrain for vapors seeping from caves.
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However, up to now, the principle of the CAES system has been set up for high levels of power as for instance the compression of air in large underground cavities using wind energy ( Toledo 2010 ).
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In the mid-1970s, Project PACER, carried out at Los Alamos National Laboratory ( LANL ) explored the possibility of a fusion power system that would involve exploding small hydrogen bombs ( fusion bombs ) inside an underground cavity.
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This gradual, yet constant, penetration created underground cavities and caves which became larger with the passing of time thus producing a hollow that was eventually unable to support the overlying top layer, which eventually collapsed and created the doline that can be seen today.
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While Maryland may be smaller than many of its neighboring states containing larger numbers of caves, its geology likewise allows for the formation of underground cavities, most of which are hollowed out by chemical processes these caves are known as "'solutional caves "'. "'Non-solutional caves "'are carved out by weathering and are typically of smaller size and of little interest to spelunkers.
