If all your air bottles are at low pressure and there is a blackout how do you start the generators?

If all your air bottles are at low pressure and there is a blackout how do you start the generators?
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Answer :

If main air bottles are empty, the emergency air bottle can be used to start the main generator. If even the emergency air bottle is empty, then it can be filled by running emergency air compressor (powered by emergency generator). Once the emergency air bottle is filled, this air can be used to start the main generator.
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