Potholing is an adventure sport that involves exploring underground caves and passages. Although this is the commonly used term for this activity, there are several synonyms for it. Some of these are cave diving, spelunking, caving, and underground exploration. Each of these synonyms conveys the same idea of exploring caves and underground passages, but they may also differ in terms of the techniques, equipment, and locations used. Regardless of the term used, potholing and its synonyms offer the excitement and thrill of venturing into the unknown depths of our planet and discovering hidden natural wonders rarely seen by most people.