The lure of caves has held humans in its grasp, whispering beckoning calls to explore their hidden depths. For centuries men have been lured into the bowels of the earth in search of adventure, exploration and knowledge. Cave systems around the world have yielded archeological treasures, unlocked mysteries and have displayed overwhelming beauty.

A natural extension of terrestrial cave exploration is the penetration of the underwater labyrinths. Diving equipment was first used in caves to traverse water filled passages between dry rooms. Eventually the activity of cave diving saw a new breed of explorer pushing back for miles into karsts with high tech equipment using knowledge and techniques to help assure survival.

Scuba diving has proven to be an extremely safe undertaking; cave diving, on the other hand, is as dangerous as typhoid and has claimed countless lives. The vast majority of fatalities have been divers that were untrained in the technique and procedures that allow experienced cave divers to accomplish cave penetrations and return alive.

Advanced divers, no matter how experienced they may be in the ocean environment, should never attempt to penetrate a cave without extensive and proper training. Several certifying agencies offer courses that begin with cavern diving within the light zone of the cave entrance to full cave certifications using progressive methods and specialized equipment.

Cave divers use reels with hundreds of feet of line that is tied off at the outside of the cave entrance and can be followed back. Equipment redundancy is carried out by divers carrying three lights, three knives and extra masks. To assure a sufficient air supply, the rule of thirds is enlisted; one third in, one third out and one third for emergencies.

For divers who hear the call of these underwater passageways, be smart, be safe and be trained.