Roland
If that limit bothers you, I have a simple experiment. First the lung volume should be 6L total, 4.8 vital and 1.2 residual(or other numbers but same proportion) and the dive to residual without a mask becomes 40 meters for a normal person and a perfect dive.
Find a good safety, do your best breathe up and start with water depth about two meters so you don't blow an eardrum. Take a deep breath, lie face down, hold on to a float and exhale as much as possible for 10 seconds. Then slowly sink to the bottom.
By going 1A to 1.2A you are simulating the part of a dive from 40-45 meters very closely. If you can equalize (Eric's method works well), you will be able to go to 5 meters plus, where the air in your lungs is down to 0.8L or 66% of residual.
Be safe, be careful, go slow and remember when you hurt yourself at this game, it may not show up for hours.
Aloha
Bill
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