I think one of the things sonar operators were trained for was to recognise submarine sized lumps sitting on the bottom. If you're broadside on you'll make a good echo for a ping coming from an approaching hunter. Specially in shallow. You need to present your slim little backside to them and creep away at 2/3.
When you're back in your homebase office you can adjust the gameplay to give unlimited air. Click the radio on the shelf.
Good luck.
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