Wow, next time Ill bring up gun control and abortion... First I would not harass (sp?) nor harm any animal. I considered it... practice. As far as the cavern diving goes, there were I believe 11 of us, 3 students and the rest were DMs and other previous students of the instructors. The instructor said that if he (and we students) felt comfortable with our skills, we would attempt the cavern. It did not go in very far but the opening was big enough to drive a semi through. Even though there is no need to justify my dive to anyone other than myself, I would like to say that with the training I have received I would have felt comfortable enough to make an emergency exit and free ascent from the 70 feet OOA if ALL else went wrong. And considering the numerous other divers with considerable experience, I feel my risk factor was quite small. Honestly I feel my first pool session was more dangeous than this overhead dive, I didnt have to swim a mile with weights around my waist and no form of bouyancy other than my own body!
I do appreciate the concern, I think honest caring like this helps make the sport safer for everyone.