"After disembarkation we will first conduct a full overhaul maintenance of 'dragon', and then fully engaged in the development of 4,500-meter manned submersibles. '' Dragon 'pilot applications voyage site deputy commander, sub-unit of the sub-body Hu Earthquake on September 16 in the "dragon" No. mother ship "Xiangyinghong 09" on the Xinhua News Agency reporter interview said. From 2009 to 2012, Hu Zhen from 702 of China Shipbuilding Heavy Industries had experienced all 4 sea trials of 1,000 meters, 3000 meters, 5000 meters and 7000 meters of "Jiaolong" manned submersible. Since June this year, he has participated in "Dragon" first pilot application voyage in 2013. At present, "Jiao Long" has successfully completed its scientific exploration tasks in China's polymetallic nodule exploration contract zone and the cobalt-rich crust exploration area in the Northwest Pacific in the South China Sea and Northeast Pacific, and returned to Jiangyin Harbor on the day of the Mid-Autumn Festival on the 19th. 5 years, "dragon" successful dive operation 73 times. Hu Zhen said the technical status of submersibles more and more reliable, more and more stable performance. The voyage in the third leg, dive within 5 days 5 times, dive strength reached the international advanced level. More importantly, the submarine's ability to control submersibles continues to improve, scientists and submersibles have been able to complete the task of conducting scientific expeditions. "After the" dragon "is delivered to the unit China Oceanic Association, I have to dive into the key technical research of the 4,500-meter manned submersible. The core part of this submersible - the high-pressure titanium manned crew and machinery Hand and so will be developed by our own, is expected to reach 90% localization rate. "Hu Zhen said. "Dragon" dived to 7062 meters in the Mariana Trench in the summer of 2012, marking our country's ability to carry more than 99.8% of the world's seabed operations. China's second manned submersible to choose the design depth of 4500 meters, to meet most of the deep-sea scientific research. For example, China's South China Sea about 4,000 meters deep. At present, the international advanced science of deep-sea hydrothermal sulfide in the 2000 to 3000 meters. "4500 meters manned submersible has many bright spots.It has 5 observation windows, to meet more scientific observation of perspective; manned space is still three, but with stairs, do not have to move in and out of the ladder ladder; cabin control The interface will be more comfortable. In addition, its 'belly' is flat. This will reduce the height of the submersible on the mother ship, to facilitate the deployment of submersibles, maintenance and storage. "Talking about" new work " Never stop. It is reported that the Ministry of Science and Technology has launched a 4500-meter manned submersible project, CSIC undertakes submersible body development work.