Abbo

Thanks. In my struggle to be brief I became obscure. What interests me most is reducing waste - less for logistical reasons and more for the discipline of honing the skills. If you're correct that a diver actually metabolizes 0.7 to 1.1 litres of oxygen a minute on a regular dive, and yet divers find they use an average of 1 to 2 litres, then the range of waste is 0.3 to 0.9 litres. The difference is a factor of 3. I assumed that everyone is implementing what is taught in every Mod 1 to a greater or lesser extent: what I was interested in is whether there are any additional tricks that get people to the 0.3 end of the spectrum?