Cave Diving - A Secret Map for Cave Divers

Cave divers still use crude research methods in order to find places where we might find caves. They look at old maps and compare them to current maps, as well as looking for sink holes on Google Maps. Different cave divers will co operate with others in exploration so they'l sort of tag team exploration efforts. My very favorite project was over 15 years ago, when i made the first accurate three dimensional map of a subterranean surface.