So a possible fix could be as follows:
1) In low depths (0m - maybe 50m or 100m): pumps or compressed air can be used to empty diving tank. That means: Surfacing is only possible if either battery or compressed air is not exhausted.
2) In high depths: only compressed air can be used to empty diving tank. That means: Surfacing is only possible if compressed air is not exhausted.
???
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