You have to look for them!
I always go to my assigned patrol area for the required 24 hours then I head 2 one of my favorite hunting ground: Either in the area of AM53 or BF12. (good for early in the war)
You'll see a lot of traffic in these area. Spend some time on the surface then some time submerged to listen. Do it yourself, if you're early in the war, your guy manning the hydrophone won't be nearly as good as you. And a hint: increase the volume of the hydrophone, cut the engines and listen!
Good hunting
Iceberg
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