When the brown stuff hits the fan, and "This sucks, I'm going back to the boat." isn't an option, it's technical diving
Well that would include cave diving
Depends on the dive. I'm coming up from a lovely 200-foot dive in Nootka Sound, British Columbia. It's a beautiful reef ... non-stop scenery. At 120 feet my toes start cramping. I'm looking at 45 minutes of deco between here and surface, so I try to relax and put my mind on how beautiful these cloud sponges are, and how ... from the 70 foot stop almost to the 20 foot stop ... I'll have carpets of sponges and strawberry anemones and all the critters that call them home to take my mind off this pain. After that, I'm in the kelp with a completely different environment to admire all the way to the surface. 25 minutes later I'm at 20 feet, switching to oxygen. The cramps have gotten worse, and I can barely move my right foot it hurts so bad. I'm looking at 20 minutes at this depth. Scenery's nice ... but all I'm thinking about is how much I want this dive to be over. I really want to get my foot out of that fin, out of that boot, and massage the cramps out of my toes. Life threatening it ain't ... but I'd definitely call it a mandatory negative ...
So, don't dive solo? Same thing could happen on a shore dive