Approaching A Convoy
It's late in the day, but not dark yet. You're at 1/3 speed in your VIIB and suddenly you hear "Ship Spotted!" It's a large convoy with escorts about 6/8K directly ahead. You take the boat down to periscope depth and ahead slow. Would going deeper help prevent the escorts from hearing your boat the closer you get? Or is it better to just stay near the surface?
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