I have been reading this thread with amusement as I started diving in 1959, got certified LA County in 1963, and went on for further certifications later. I won't bore you with a lot, but I was diving mostly solo for the first several years of my diving experience, before even being certified. I was a teenage diver, and dove in rivers and lakes in Oregon, again mostly solo while my family was fishing. My water skills were very good, as I was on. The high school swim team, and had undergone YMCA Lifesaving classes, a bit later becoming a WSI (Water Safety Instructor). On one of my first lake dives, in Elk Lake, Oregon off my Dad's 7-man life raft, we had my Grandmother out with us in the raft, and I went down with m y 38 cubic foot tank and Healthways Scuba double hose regulator, playing around in 30-40 feet of water, watching fish navigate through the water weeds which reached up toward the surface, watching small bibles emulate off the plants, seeing those very trout my family was fishing for ignore their bait, and enjoying the feeling of weightlessness.
My Grandmother became increasingly agitated when after over five minutes I did not surface, and exclaimed to my Dad, "Tell him to come up, tell him to come up!" According to my brother, who witnessed this, my Dad simply looked at her and said, "How?" I surfaced after a thrilling 20-minute dive.
Later I went through the. U.S. Naval School for Underwater Swimmers in Key West, Florida where the buddy system was impressed upon us, but followed that with U.S. Air Force Pararescue Transition School, where independence was encouraged (it's damned near impossible to "buddy dive" off a parascuba jump).
I have continued diving continuously since those first, mostly solo dives in the beginning, and most often now solo dive (the last being last Monday). I do underwater photography, observation, and dive a lot of vintage gear. Since I dive shallow, I rarely have an alternate air supply, but in many configurations dive with an octopus. If I am diving a very old regulator, I have a twin-post manifold where I set up the double hose regulator and a reliable single hose regulator on the same set (usually my Scubapro Mk V first stage with my AIR I second stage. I have also played around with independent doubles, and with the Dacor Nautilus CVS. I have been doing this for decades, though I have no solo dive certification.
In the 1970s and 1980s I was a NAUI Instructor. During that time, there were articles describing virtually all instructors as being solo divers, as with students you have no reliable buddy. So I guess I have a rather different view of solo diving, in that I simply go out and dive with an objective in mind, be it underwater observation, video work on underwater life, underwater photography, or testing vintage gear.
This video will give you a taste for some of my solo dives.
SeaRat