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Probably somewhere around 2-3psi I would think. Not sure about the rest of you but I have to start clearing my ears at around 6-8 feet of water pressure. If you need to clear your ears in a 1ATM during operations, that indicates a problem of some kind which should send you to the surface. The two main issues I can think of that you want to avoid is an internal pressure/dive duration that ends up requiring decompression; a high enough pressure level that introduces O2 toxicity. Both of those situations would be difficult to get to without the pilot knowing something was wrong since even without any gas monitoring you'd be clearing your ears plenty of times. Unless you are drawing a vacuum as part of the pre-dive systems check (like DW-2000 does) there should be no clearing of ears unless there's a problem maintaining 1ATM within the cabin. Jon On 3/27/2012 1:35 PM, JimToddPsub@aol.com wrote:
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