China's unmanned submersible "Haidou-1" prepares to dive into waters near the Mariana Trench in the West Pacific, the deepest area in the world, during a scientific expedition on July 1, 2016. During the trip, the submersible dived to a depth of 10,767 meters, setting a new record for the country. It is another milestone in China's maritime science journey after Jiaolong manned submersible. In June 2012, Jiaolong reached a depth of 7,062 meters at the Mariana Trench, the deepest of China's manned submersible. China achieved major breakthroughs in scientific and technological development in 2016. [Photo/Xinhua]