Same here. I can see myself doing some easy BASE jumps in a not too much distant future...but the idea scuba diving already makes me uneasy (although I love to swim or dive with just a mask, fins and a snorkel).
Cave diving is ABSOLUTELY out of the question. I have a lot of respect for those guys but I would never dare to do it myself.
BTW, I've found Dave Shaw's website
here. There are a lot of interesting details about his gear (check the urinator

), but it is also kind of sad to see that the site has not been modified since his last update, a couple of days before his fatal attempt.