Well, it depends... is it dark just because it's night, or is it dark because it's night and theres a fricking storm that won't let you see past 300 meters?
If your in the first category just use the usual run on the surface then dive for a listen routine, eventually you'll get close enough to see the target.
If however your on the second case... well, I've managed to sink ships while totaly blind, but it's very dificult to do... let me see if I can work on a tutorial for that.
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