I have been within 500 to 700 meters of a convoy, creeping on the surface at night at 2 knots without having to go decks awash. And there were several escorts about.
I was so close i let loose with a spread of 4 fish, and executed a crash dive - it was a gamble as to whether or not i would be under before the first hit.
The stern was still out of the water a bit when the first one hit, but it was only a few seconds after that i was on my way out of that place.
If your at high speed you will cut a large wake - i suppose thats what they spot.
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