Operation Seehund (ii)

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This was a German naval minelaying operation in the Kara Sea by Oberleutnant Walter Wichmannís U-639 (17/28 August 1943).

After laying 24 TMB mines in the estuary of the Ob river on 21 August, the U-boat was sunk by torpedoes from the Soviet submarine S-101 with the loss of all 47 of its crew.