The text book answer for that is 130' if you have the basic certification. I know of quite a few people that have gotten "Narc'd" going too deep. Have you heard of this? Your body starts to wig out with all the nitrogen you are loading into your system... you get a little loopy. My Aunt started following a fish at 90' and kept going to about 180' My uncle grabbed her and pulled her back up.. did a saftey stop and asked her what the $#@& she was thinking. She didn't really recall what the fuss was about, and didn't remember going that deep. So pushing the limit with diving isn't the smartest thing. Most of the good stuff to see is at 30 to 40 feet anyway.
Having said that, if you are trained on a rebreather, you can go deeper longer since you are not loading as much nitrogen into your system..... something to look into if you are interested in deep diving.
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