Sorry if this type of message has been posted before...
 I was wondering if there is anyway to cnserve air while diving.. If I do a 
little dive to 30-35 feet, my air supply lasts anout 37 minutes average. When 
I surface at 500 psi, my buddy has about 1300 - 1500 psi left and I feel bad 
that he has to cut his dive short because it is time for me to surface. Are 
there any suggestions?
Thanks,
Chris
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