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In-Reply-To: <199507301433.RAA47412@vi*.hu*.fi*> > I feel that this type of deep deco dives you describe are definitely > at technical level (as opposed to sport diving) (which I would define > as 40 m max and direct ascent). Diving you described is roundabout > BSAC limits, isn.t it? The BS-AC recommended limit is 50m, for full trained divers. However, there are quite a few clubs/ people diving 60m+ on air, and have been for some while. At least one group where diving 60m (on air) in the 1960's. > A question: What kind of procedure do you use for repetive diving. > Do you follow tables or computers? What would be a typical surface > interval? Most (air) diving is done on computers, with the Alladin Pro/ Monitor 2 being the most common, but with a good number of Suunto's. Computers started being used in large numbers when the original 'black' Alladin came on the market. The BS-AC have adopted several tables over the years as their 'official' ones. When I first started diving in the early 1970's, the old Royal Navy tables were in use, then the BS-AC/ RNPL tables came in, and lastly the BS-AC 1988 tables. However, the RN and BS-AC/RNPL tables had great penalties on repeat diving, so US Navy and Buhlman tables were used by many. The first Bulhman tables I saw/ used were brought back from Switzerland by a club member in the late 1970's. Few sports divers now use tables. Two hour minimum surface intervals are generally used for sports diving, with a 'main' dive to say 30m-50m and a second dive to 10m-20m. However, most serious deep divers gave up second dives quite some years ago, as they were generally held to be rather too likely to produce decompression sickness after a major first deep dive. Things have almost gone round a full circle. A lot of my diving, down to about 60-65m, is on air with 3 litre side tanks of Nitrox 50 and 100% oxygen for decompression. The N50/oxygen drastically reduces the decompression times, but there are no computers yet which can handle two independent tanks of air plus nitrox plus oxygen, so I am back to using tables. I have generated my own tables using ProPlanner software. > Reima Raty > CMAS *** > PSA Class 4 Deep Air > HElsinki > Finland Dave Wilkins
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