Well,
Sorry to barge in on a heated subject. (sorry for the double post,) I think it has been stated before. But as for me, I think it has everything to do with conditions. Current, temoperature, purpose, etcetera. I see no reason to go great depths unless I have a reason, such as a good wreck in the South Pacific. Although I have not been to 200fsw, I hope to some day, and am in the process of learning with doubles, dry suits and trimix. I am like others and do not wish to get narced out. I have no desire to flirt with death. The pages of history are lined with those who have. But, I believe if you use the best knowledge and equipment availbale, you can safely dive when and whereever you want to.
Great depth and narcosis scare me. I feel that I could just go on and on, so I have to be carefull. I know that if I tried to go below 130fsw on air, I would most likely not come back up. But that does not stop me from learning the benifits of trimix. So with proper training, good conditions, and a purpose for diving, I think I will see those wrecks in the South Pacific at any angle I choose. I fear those that have other reasons to accomplish their objectives. and may end up learning the hard way.
Mr. B