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The original was posted on /r/todayilearned by /u/Morella1989 on 2025-07-31 18:07:36+00:00.

Original Title: TIL Krystyna Chiger survived the Holocaust by hiding in Lviv’s sewers with her family. While there, her grandmother knit her a green woolen sweater to keep her warm, now displayed at the U.S. Holocaust Memorial Museum. They were helped by Leopold Socha, a Polish Catholic sewer worker.