On Thurs. 21 Dec 1939 Between 0725 and 1016 hours, German submarine U-21.....

Between 0725 and 1016 hours, German submarine U-21 sank two neutral Swedish ships Mars and SS Carl Henckel with one torpedo each. The German submarine did not pick up any survivors; only 8 out of the 36 floating in the water survived until when help arrived on the next day.

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