<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Hi All,</DIV><DIV> Thinking about testing my life support. Will obviously have some people outside the sub watching me, and talking via radio. But I was wondering if there would be a point at which I should abort the test when the CO2 gets to a certain point . If it levels off and stays at a constant but is some what elevated would it be ok to monitor that situation ? Like say it levels off at 2000 ppm and assuming my oxygen is at a constant 20.8 % ? </DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV> </DIV></DIV>