Photo taken on July 21, 2016 shows the research vessel Zhang Jian carrying "Rainbow Fish," a submersible capable of diving up to 11,000 meters in the sea, at Shenzhen Chiwan Wharf, south China. Chinese research vessel Zhang Jian took a break Thursday in Shenzhen after its exploration in the South China Sea and prepared for exploration in sea waters near Papua New Guinea. (Photo/Xinhua)
