In game I know (at least from SH3) that pressing "Emergency surface" once would activate the compressed air reserve to shoot you upward. Pressing the command twice actually increased the effectiveness/speed (3rd time? Think 2nd press was the maximum rate).
As far as gameplay goes even from 400' and double-emergency surface there was always 70% or so compressed air left in the tanks and thus there was never any real concern of running out.
For real WWII subs wasn't boyancy changes at depth cause to use some of this compressed air. Was running out of compressed air ever a real concern?
It seems weird to give us this guage when 99.999999% of the time it's of no concern.
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