China's submarine rescue ship Changdao (Hull 867) sets sail from a naval port in Qingdao of east China's Shandong Province on Sept. 13, 2017. A Chinese naval fleet departs Wednesday from Qingdao for Russia's Vladivostok to take part in the second stage of the China-Russia Joint Sea - 2017 military exercise with the participation of warships of the two countries. (Photo/eng.chinamil.com.cn)
