Geological Cave Indicators
Most of the obvious caves in countries with a well-established caving community have already been discovered and explored, so cavers must search for new caves. This is most commonly accomplished while ridgewalking, the practice of scouring the countryside, in areas with cave potential, for new, previously undiscovered openings to the underground. These may be found in sinkholes, in rock outcrops or anywhere the ground is underlain by limestone or other soluble rock. Areas underlain by lava flows or where lava tube caves are found may also contain new caves.
If the discovered feature is either blowing or sucking air in great volumes, it is an encouraging sign and indicates that there is potential for a large or extensive cave beyond.
Read more about this topic: Cave Digging
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