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Carl G Heinzl writes: > By the way, my rule of thumb is... > > 3 minutes at 15' for all dives up to 100' > minimum of 5 minutes at 15' for all dives up to 130' > minimum of 10 minutes for dives below 130' Actually, my rule is somewhat inverted from yours. Assuming you do somewhat ML dives on every dive, you will actually be more likely to build up significant loading on shallow dives than on deeper dives. Some of the most dangerous dives are those conducted in the 50-90fsw range. Another factor to consider is the delta-Pressure (dP) that you pull. The USN has finally followed Karl Huggins' lead and the new model coming out next year will actually use the delta in overpressure as the risk factor. I expect that you'll see a lot more people following the Thorfinn's rule of doing very deep safety stops after deep dives: requiring a 1-2 minute stop at 60fsw is an excellent idea to avoid the massive overpressure deltas that traditional stairstep "pull" decompression models use. I always start my stops at 30fsw or deeper, regardless of the dive, even when my first stop isn't until 20 or 10fsw. When doing deep dives, I stop at 60fsw for a minute or two, and then proceed at 20fsw to the rest of my stops. And I generally ride the stops deeper than required. When you are doing inexact divecomputer-controlled decompression, the slowdown in offgassing and increased slow-tissue ongassing are more than compensated for by the reduced risk of ceiling violation, and especially the reduced dP you experience. Cheers, David Story NAUI AI Z9588, PADI DM 43922, EMT story@be*.wp*.sg*.co* Better diving through lithium.
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