Urchin was transferred to Poland in January 1941 and renamed Sokół. Her wartime results are described as respectable. On returning to the Royal Navy in 1945, she recovered the name Urchin. Decommissioning followed in 1948 and scrapping in 1949.
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Urchin and Sokół: a U-class submarine in Polish service
Urchin served Poland as Sokół before returning to the Royal Navy and surviving into the late 1940s.