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The Haiyang-6, a Chinese research vessel, carried out surveys in the Mariana Trench earlier this year to find the best environment for the Jiaolong, the world's first manned submersible designed to reach depths of 7,000 meters below sea level.

The annual drill is not aimed at any specific country or target and is in accordance with related international laws and practices, the ministry said in a statement.

Wang called on officials from the organizations to pool wisdom and offer honest and good advice that focuses on major issues concerning the country's reform, development and stability.

Yang said the priority of the rescue team is to search for the trapped miners. In the meantime, medical workers have been asked to treat those injured with all-out efforts.

School cafeterias in China must be run and managed by schools and may not be operated by outside contractors, according to the regulations.