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The Polarstern, an icebreaker and research vessel, arriving on Monday at the harbor of the northern German city of Bremerhaven. Credit...Patrik Stollarz/Agence France-Presse — Getty Images
The Polarstern, an icebreaker and research vessel, arriving on Monday at the harbor of the northern German city of Bremerhaven. Credit...Patrik Stollarz/Agence France-Presse — Getty Images

After...