Lost gas on multiple gasses - crystal ball is missing.

[captain starfish]

Say we're diving 21% with 40% and 80% stages.

I want to do the main plan, switching at (say) 27m to 40% and 9m to 80%.

Run the plan, all good.

Now hit lost 40% - we get some longer stops on 21% before switching to 80% at 9m.

Now lose the 80% as well - fine, it blows out the 9/6/3m stops too. This is expected.

BUT

In the lost 40 + lost 80 scenario, I have longer stops on 15 and 12m too. This is an issue because I'll follow the main plan until a switch goes wrong at 27m, change to the no40 plan and assume 80 is ok until I get to 9, hey, I'm not going back to 15m if it turns out my 80 is kaput too.

Bit of a PITA I imagine, because it would most likely need multileveling of the n-1 previous lost gasses' profiles until each gasses' switch depth. But, if it's possible, it would save me having to ignore the "lost gas" profile and instead just running them manually.

[eskil]

You're right. This is only with VPM-B, ZHL16 does not have this little detail due to their differences.

I'll have to put some thought into what's the best approach here. The current way gives a solid lost-gas plan if you lost both your stages while at bottom. Your scenario of first losing one gas, then the other seems less likely.