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> Can you translate this deep stop stuff into rebreather terminology so I > don't embarrass anyone. (Pauline has already decided to leave the body > where it falls, provided my name and address is in the rebreather.) No translation required - it doesn't matter if you are doing OC or CC - the method is the same. The idea is to slow down the initial ascent rate. One way to look at it (I have no idea whether this is reflective of physiological reality, but I'd put money on it) is that you need to allow time for your circulatory system to "catch up" with the big drop in ambient pressure. The theoretical best way to do this is via very slow deep ascents, but this is impractical for most divers. A slightly more practical method would be to stop every 20 or 30 feet between the bottom and the first required stop, but I'm not yet ready to recommend this method until I've had time to play with it myself. I have a hunch it will be most useful on dives where your bottom time is in the range of 30-120 minutes or so at depths of 200-400 feet or so, but don't quote me on that. Then there is the method I outlined in the earlier post. I think this is a good compromise between what people are used to doing and what is probably physiologically ideal. It's also quick & easy to figure out on the fly. > What are compartment-based tables, and which one work? Basically, any table or dive computer you've ever seen is based on a compartment (="Haldanian", "neo-Haldanian, "Buhlmann", etc.) model. There are some bubble models out there. I think ScubaPro once had a computer that looked at bubble math. Abyss uses some RGBM math (another bubble model). But most of them are compartment models. The way you can tell a profile using compartments is that there is a huge gap (more than 30-50 feet) between the bottom and the first "required" stop. This is the sort of shape I'm suggesting you avoid - break up those big delta-P's (drops in ambient pressure). > Can I use my > Cochran Commander Nitrox (I HATE THAT NAME), dive within the parameters of > that computer,less than 157 feet on a 1.2 set point and still have to do > the "deep stop"? You don't "have" to do anything. If you trust my advice, and you want to reuce your probability of DCS, lower your post-dive fatigue, etc. etc., then you'll want to do the deep stops. You can use any software or computer you feel comfortable with, but as far as I know, none of them on the market break up the initial ascents. That's all I suggest you do. Hope that helps. Rich
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