You must diving to pass a thermal layer and be at normal speed to not miss the annoucement a good method is to dive at dawn each day dive all the way until you find the layer it is safe to say that the layer will be at about that same level in the area you cover over the next 24 hours and you will at least have a rough idea how deep you will need to go to hit it.Though you want to pass below it to get the advantage it offers.
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