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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NYGM+H.sie v16+Stiebler 4C+MaGui WS
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