What amazes me is the "old timers" aka DeLoach,Eckoff,Zumrick etc ALWAYS run a reel and never do visuals. These are the people who explored these caves,surveyed them,and intimately familiar with them. Everytime I did a dive with them,there was always a primary and jumps/gaps had reels placed. These are the people who lived through the 70s where there was so many cave diving fatalities the sport was almost banned. They took the lessons to heart from all the fatalities,and are survivors with tens of thousands of cave dives collectively,so I wonder why every few years we reexamine this subject. If you do it,and your probability of surviving seems to increase,and it only takes a few moments to do..........