I'm the first one to hold the rating of solo cave diving instructor to my knowledge.
I had taken the SDI Solo class from my TDI cave instructor in the cave environment. He got in trouble with SDI/TDI for teaching an SDI class in overhead. It was one of the best courses I had taken placing me in a myriad of very challenging situations requiring creativity to "survive" and not just rote procedures. It opened up a whole new world for me and led to a multitude of solo dives in several countries and the ability to sneak dive in places that couldn't be accessed without facing fines or jail outside the USA.
After I became a cave instructor, I thought a survival class for team breakdown in overhead or a solo cave class would be beneficial to those who wanted it. I was the technical director of PDIC at the time so I thought I'd use that clout to push for one of the two options. I approached the owners and board of directors. We had two GUE instructors on the BoD. One was a GUE Tech 2 IT and the other a GUE Cave 2 IT. I was laughed at and told, "Kid, if you can get that past our corporate attorney and the insurance company, have at it." I wrote the standards, the legal documents, training materials, and a letter explaining the safety aspect of the course and it was approved to the dismay of the agency.
I held the PDIC Solo Cave Instructor rating from 2007 - 2011. PDIC was sold to Tom Leaird of SEI who suspended most, if not all, tech and cave programs. I was offered the position of international training director for the Americas at PSAI which I held from 2011 - 2016.
Some of the things students learned: Take emergency oxygen into the water. Position cell or sat phones in water tight containers within reach if you are bent and cannot extract yourself from the water. Prusik yourself out of holes if you are too injured to climb with legs. Getting yourself or gear in and out of holes without rope. Have hydration, aspirin, etc., available in water. Wilderness first aid. Activate a cyalume light stick and keep it on in your pocket or notebook so you don't find yourself completely in the dark if your 3+ light sources fail. Start the dive on your bailout, back-up, then primary regulator to truly make sure they are working well wet and at depth. Techniques to slow and improve your heart rate and breathing. How to use your mask for bubble checks or as a mirror underwater. Modifications to buddy procedures. How to get more use out of your buddy bottle. Different gas management strategies. Underwater repairs. Creative challenges. Discipline reinforcement. More. I don't have the outline in front of me, but those come to mind.