I remember conducting a surface attack on a lone merchant on a fairly clear night with decks awash at approximately 1200 yards. My first shots missed (i think i miscalculated the torpedo depth) but he never spotted me or the torps so it gave me a chance to recalculate and ultimately, skin him. I should have saved the game and try the same thing fully surfaced to see if would have spotted me. I might try that with the mission editor some time today. I'll keep you guys updated.
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