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>You are diving at sea level and you descend to a depth of 33 feet
>sea water (33 fsw).  You fill your bouyancy control device with
>enough air to become and remain neutrally bouyant.
>
>The next day you arrive at 10,000 feet altitude to dive in a lake
>that contains sea water.  You descend to a depth of  23 feet sea
>water (23 fsw) and fill you bouyancy control device with enough
>air to become and remain neutrally bouyant.
>
>The question is, at 10,000 feet, does the bouyancy control device
>contain less air, the same amount of air, or more air compared to
>sea level?

Less air is needed at the lower pressure to get the same volume
displacement.  However, there are other effect too.  Gravity is less,
less compression of the wet-suit etc etc etc.....
So the first question to ask if the amount of "lift" needed
for neutral bouyancy has changed ?

j

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