I've read explanations of the various compartments (constructs) and their associated half life times (fast-slow, 5 min-120 min or whatever). I never see the explanation where this is related to depth. The explanation is the 5 minute compartment is half "full" after 5 minutes but this concept is never related to depth. If I dive to 30 fsw and stay 5 minutes the 5 minute compartment isn't half 'full" is it? I know that the deeper you go the controlling compartment is the faster compartment and as you ascend the faster compartment is also the first to clear so as you stay underwater longer the slower compartments would start to control. If I go to 130 fsw the 5 minute compartment would probably be the controlling compartment but if that's the case there has to be some tie in between 5 minute compartment and depth. Without any explanation of course I understand that the partial pressure of nitrogen is increasing with depth and my NDL times are becoming shorter or my deco times are becoming longer. So in effect I know what is happening in reality but I'm trying to relate that to the deco theory terminology.