Cave: a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea.
However for the purpose of this discussion the difinition needs to be more specific.
Cave: a geological formation that has no natural light, has minimal access to the surface, of which there are three natural processes of creation; Lava flow, tectonic faulting and desolution.    Where the exploration will require specialized knowledge and equipment.
Caver's Motto: Take only pictures, leave only footprints, kill only time.
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