CaveSloth
Contributor
I can be in perfect neutral buoyancy and then flip over so I am facing up with my tanks facing down and then I sink. WHY?
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When you roll upside down, your lungs are now quite far below the second stage. That means the work of breathing increases, so you have to pull harder to inflate your lungs. This will feel like you are holding your lungs more full, and so you will tend to keep a smaller lung volume resulting in sinking.
There's also the pressure effect on the bladder to consider.When you roll upside down, your lungs are now quite far below the second stage. That means the work of breathing increases, so you have to pull harder to inflate your lungs. This will feel like you are holding your lungs more full, and so you will tend to keep a smaller lung volume resulting in sinking.