They sometimes occur over x128, but there's a bug that sometimes occurs that won't let them spawn at high TC's. But if they do spawn, you have almost no time to react, or even sometimes, they have already made their first attack run before you've dropped out of TC.
It gets worse the later into the war you go. They '44-'45 career i recently played, I was glad for snorkels, for i almost never surfaced. Even then their radar picked up the mast. But for the first 12 months, it's an annoyance at worst, but quickly picks up. By '42-'43 ish, the Bay of biscay was a shooting gallery.
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Luck is a residue of Design.
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