No such thing as optimal depth for hydrophones as thermal layers affect sensors in the sh series, your best bet is just to stay above the layers, slow down to 1 or 2 knots or even stop, do a couple of sweeps and crank the speed up again. Even at night you should be diving once in a while to check your phones, hydrophones have greater range than the mk 1 eyeball. Once you have access to radio and radar df, then the surface is your best bet for detection, but you are also much easier to find by that point.
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