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Karl Majer writes: >More importantly I'm looking for someone who can demistify multi level >diving for me. I had a bounce dive in Guantanamo Bay, Cuba with to 125 >feet, for about 1 min, then the rest of the dive was along the coral >shelf at 60 feet. I need to know how to determine the proper decomp times In general, if you want to go multi-level diving, buy a computer! Having said that, it is reasonable to plan a 2-level dive with Buehlmann tables (and probably 3 level, much more than that is difficult to keep track of). For this example, 125 ft = roughly 38 metres. 60ft roughly 18 metres, surface interval 0 minutes. A 10-minute dive at 39 metres gives you a re-entry RG of D. After a surface interval of 0 minutes, your second dive depth is 18 metres. RG of D means you subtract 33 minutes from the safety-stop time of 51 mins to give you an extra 18 minutes. If your total dive time doesn't exceed 28 minutes, and you have spent less than 10 minutes at 38 metres, your requirements are only a 1 minute safety stop at 3m (10ft). Exit RG is F. If you exceed 28 minutes total time you are required to do an 11 minute stop at 3 metres (and you are into the red zone, which you are supposed to avoid). If you exceed 47 minutes total time you are off the tables. I was right first time. Buy a computer. Regards Pete
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