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If you stay submerged for a really long time, oxygen level drops eventually to 17 % and then the chief engineer will start using reserve oxygen to allow you keep going submerged. The needle is for the reserve oxygen and once it starts moving it won't move back because the reserves come from cartridges that need to be replenished at ports.
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Yup got to thinking about it in the shower this morning and it makes sense. The gauge is only for the compressed O2 remaining, not the
atmospheric O2 remaining.
Is there a gauge that shows me atmospheric O2 remaining? Or do I have to hope I just see/remember the Engineer's reports?
Steve