I have this exact same thing in my current patrol. I attacked a convoy of all Tankers in the Bismark Sea, escorted by four Destroyers. My initial attack saw two of the Tankers go to the bottom. The Destroyers countered with depthcharges. While the attack was going on, I heard the sound of secondary explosions. I did'nt know what it could have been, since both my targets went down. After manageing to rise to periscope depth, I noticed there were only three Destroyers, and that black ship symbol appeared on the map. My only guess is that one of the Destroyers blew himself up during his depthcharge run.:hmm:
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