China's research vessel Haiyang 6 completes mission 2019 (1/6)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)

China's research vessel Haiyang 6 (Ocean No. 6) returns to Guangzhou City in Guangdong Province on Oct. 23, 2019 after completing the 55th scientific expedition. The vessel sailed 35,000 kilometers in 122 days. (Photo: China News Service/Tang Guijiang)