As you dive deeper at some point a crewman will say "passing thermal layer" you must be at normal speed to hear it. Depth depends I have seen them as shallow as 100 feet or so other times as deep as 200 ft you just have to listen for the audio que to know where it is. If you are in water that is less than 150 feet deep you might not find one but in deep water there will always be a layer.Just be sure that you are under the layer not just above or in it or you wont get the full effect.
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