SubBubble - one note - you can use High TC at will when you near a single merchant and are submerged - the reason being that a merchant has no passive or active sonar gear - and so as long as your underwater your undetectable regardless of TC. A merchant will only zigzag when it either spots you visually, spots a torpedo wake visually, or when warned by a nearby ship that detects the same (or goes boom).
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Good Hunting!
Captain Haplo
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