Unmanned boats conduct geological survey in Hainan
        
      
      
        
          
          China Daily/Xinhua |
          Updated: 2017-10-24 07:22
           
           
           
           
        
         
       
      
      
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   | Investigators lower Jinghaihong, an unmanned boat, to conduct a geological survey off the coast of Sanya, Hainan province, on Oct 23, 2017. [Photo/Xinhua] |