 On 27 November she sank the 5,922 ton Dutch merchant ship "Polydorus" after a 50-hour pursuit, the longest recorded by any U-boat in the Second World War.Off Cape São Roque, Brazil, on 13 December 1942 the crew of "U-176" boarded the 1,629 ton Swedish cargo ship "Scania", and sank her with scuttling charges after the crew had abandoned ship.On 16 December she sank the unescorted 5,881 ton British cargo ship "Observer" with two torpedoes.