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George, Do I need to go back to school here??? Where did you get this idea??? Where is "nsu.acast.nova.edu"??? The pressure under water is basically constant depending on depth. I don't think the waves and swells add to the pressure (ie: depth). I just can't believe that any wave or swell would direct the effect of pressure change directly down on the diver. If that were so, then, how come your eardrums do not blow out or why doesn't everyone have an embolism when the "5 or 10" ft wave or swell passes overhead. While the wave shape is not exactly sinusoidal it is somewhat symetrical going above and below the mean surface average (crest & trough) and therefore promotes an average depth value regardless of wave size. NOW, if a 5 ft tidal wave came along (a crest without a trough) and permanently elevated the surface, then, you have a problem. Actually, if that happened everyone on the coast would have a problem. The issue is not if waves or swells of larger size pass over you; its how you handle them while hanging. If you cannot control your body position and buoyancy and are hanging on the anchor line and you are moving up and down in the water column with the effects of wave, swell, and boat movement, then, you not only have a problem; you are the problem. The DIR concepts and what is learned in cave diving promote good equipment configuration and body & buoyancy control skills. These are elements that every diver needs for safe diving and survival. r/ Tim At 02:27 AM 11/25/98 -0500, George P. Wentland wrote: >What happens when a 5 foot wave goes over head? >Answer: The ppO2 becomes to high 1.76 ppO2. When that same 5 foot wave goes >overhead when at 30 feet on 80% it would give you 1.65 ppO2. Maybe if your >doing it right you can swim up and down with the wave action? Or maybe you >only DIR in caves where you don't have as many adverse conditions. Now I >just mentioned a 5 foot wave, what if its 10+ which is not uncommon in the >Northeast where the pizza stained Doria T-shirt strokes dive. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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