If you are indeed planning to do deep dives, I strongly suggest that you spend some time acclimating to increasing depth and determining your reaction to narcosis. Before I started doing my deep dives, my maximum depth was on the order of 140-150 fsw. When I decided I wanted to hit 200 fsw (to film certain deep critters), I spent about two months gradually increasing my depth and assessing my response to narcosis. This involved on the order of 30-40 dives gradually increasing my depth in 5-10 foot increments.
At that time I was doing about 300-350 dives per year. Currently I'm only doing about 100 dives a year with the deepest one over the last year being 150 fsw. Because I have not been conditioning myself to higher nitrogen loading, I find I get narc'ed as shallow as 105 fsw and would not consider 180-200 fsw dives without reconditioning myself over time.
I should add that this is strictly based on my personal experience and should not be considered as a specific guideline for other divers. Your physiology, conditioning and other factors are different than mine (and hopefully better since I'm a bit of a geezer after 48 years of diving). I would never recommend specifics regarding such deep dives to anyone else since I am not familiar with their physiological state and skills. However, the general procedures (acclimitization over time to depth) seem to be worth considering for anyone who is interested in trying deep dives.
At that time I was doing about 300-350 dives per year. Currently I'm only doing about 100 dives a year with the deepest one over the last year being 150 fsw. Because I have not been conditioning myself to higher nitrogen loading, I find I get narc'ed as shallow as 105 fsw and would not consider 180-200 fsw dives without reconditioning myself over time.
I should add that this is strictly based on my personal experience and should not be considered as a specific guideline for other divers. Your physiology, conditioning and other factors are different than mine (and hopefully better since I'm a bit of a geezer after 48 years of diving). I would never recommend specifics regarding such deep dives to anyone else since I am not familiar with their physiological state and skills. However, the general procedures (acclimitization over time to depth) seem to be worth considering for anyone who is interested in trying deep dives.