China's 1st domestically built polar icebreaker berthed at home port in Shanghai (1/5)

China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", sails on the Yangtze River in China, July 23, 2019. (Xinhua/Zhang Jiansong)

China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berths at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)

China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berths at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)

Workers help China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berth at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)

Workers help China's first domestically built polar icebreaker "Xuelong 2," or "Snow Dragon 2", berth at its home port in Shanghai, east China, July 23, 2019. (Xinhua/Zhang Jiansong)