Editing Cave digging (section)

==Geological cave indicators==
Most of the obvious caves in countries with a well-established caving community have already been discovered and explored, so [[caver]]s must search for new caves. This is most commonly accomplished by scouring the [[countryside]] in areas with potential for previously undiscovered openings to the underground. These may be found in [[sinkhole]]s, in [[rock (geology)|rock]] outcrops, or anywhere the ground is underlain by [[limestone]] or other soluble rock.<ref>{{cite web |url= https://www.virginiacaves.org/vss/index.php?option=com_content&view=article&id=77&Itemid=208|title= Chapter 1 - Searching|author=<!--Not stated--> |date=<!--Not stated--> |website= Virginia Speleological Survey|access-date=29 April 2024}}</ref> Areas underlain by [[lava]] flows or where [[lava tube]]s are found may also contain new caves.{{citation needed|date=May 2024}}

If the discovered feature is significantly draughting air either in or out, this is an encouraging indication that there is potential for a large or extensive cave beyond.<ref>{{cite journal |last1= Gabrovšek |first1= Franci|date= 3 April 2023|title=How do caves breathe: The airflow patterns in karst underground|journal= PLOS ONE|volume= 21|issue= 3|pages= <!--Not stated-->|doi= 10.1371/journal.pone.0283767|doi-access= free|pmid= 37011070|bibcode= 2023PLoSO..1883767G|pmc= 10069778}}</ref>