Hi KenGordon,
what would be your answer to the following statement:
- Perdix AI in OC REC, Transmitter, Singe Tank Nitrox 32%
- Dive planned with a stop of 3min at 40m to look at a nice cave entrance
- NDL is reached after 3min, as planned, so deco stop mandatory. GTR is OFF (as deco stop)
- my buddy is having an issue with his equipment OR make up another fact that makes me stay longer than 3min at -40m
- what data should I monitor to "estimate" how long more I could "reasonably" stay at 40m ?
Nothing sarcastic here, I hope you understand my point and the fact that I want to learn something from experienced divers.
Let’s assume something happens at 40m, your buddy lost his gas.
You will use more air in that situation, let’s say 30l/min x 5bar so 150l/min. Before you are ready to ascent you need 2 minutes to get ready, so 300liter.
Since you have no deco gas you will have to make it to the surface. If you don’t stop for deco you will need 4 minutes on a average depth of 20m. That’s 30l/min x 3bar x 4min, so another 360liter. 660liter x 2 for your buddy, that’s 1320 liter or close to 120bar on a 80cft.
Don’t forget you have to solve you problem in a smooth way, don’t panic, have a smooth ascent and skip deco to make it with this amount of air.
Long story short, don’t do those kind of dives without the right training and gear for it.