After more than six years of excavation and salvage, the shipwreck with thousands of artifacts succeeded in getting out of the water. What kind of story is behind the beautiful artifacts? What are the difficulties faced by underwater archaeology in the past and what black technologies were used? In June 2012, CCTV News Channel broadcasted the underwater archaeological excavation of the "Xiaobai Reef I" shipwreck in Xiangshan. At 21:52 yesterday, CCTV's ten sets of "Exploration and Discovery" columns once again focused on this Qing Dynasty shipwreck, telling it to see the sky again. s story. On July 12, 2014, after six years of hard work, our underwater archaeologists finally worked in the Xiaobai Reef, Yushan Island, Xiangshan County, which is 26 kilometers away from the land and has the “Asian First Fishing Ground”. The "Xiaobai Reef I" was salvaged out of the water. The shipwrecked ship has a seal of business name, colorful porcelain, precious blue-and-white porcelain, a famous teapot made by famous artists, rare coins covered with bilge, and even the ship itself is a specimen of great research value. In 2016, the “Xiaobai Reef I” underwater archaeological project stood out from more than 4,000 water and land archaeological projects in the country from 2011 to 2015, and won the third prize of the “Tianye Archaeology Award”, the highest quality award in China's archaeology. The submarine slab "leaked" the position of the shipwreck. The title of "Small White Reef I" underwater archaeology documentary is divided into two episodes. The last episode aired last night is about the discovery of the shipwreck by underwater archaeologists. Under the endless sea, where is the shipwreck? Underwater archaeologists first probed the submarine snoring, and after discovering the suspected location, they sneaked into the seabed for manual search. Luo Peng, an underwater archaeology member of the Ningbo Municipal Institute of Cultural Relics and Archaeology, who first discovered the general position of the shipwreck, recalled the scene of the year. He said: "I started searching under the water with the water point as the center. The stones I touched in the past were irregular. The stone in this place is different from other places. It seems that there is a feeling of falling off the biscuits. The layers are stacked and very regular. I felt that these stones are not natural reefs, like slate. The thing, but it is not certain. After the water, I immediately reported the situation to the team.” The next day, the underwater archaeologists found the wood two or three meters away from the slate. The players opened up the sand, shells and other objects that covered the surface. Under the light of the flashlight, a large piece of wood (the ship's board) appeared. In the subsequent clean-up process, the team members also found a seal and some porcelains such as broccoli and blue-and-white bowls. When collecting sand, they found a large number of ancient coins in order to accurately grasp the preservation status of the shipwreck and find the iconic cultural relics that determine the age of the shipwreck. The archaeological team conducted key investigations and trial excavations on the shipwreck. Local excavation is a common method adopted by archaeology, but underwater archaeology is different from field archaeology. Digging a pit on the land, the stratum relationship is clear at a glance, but at the bottom of the sea, the situation is very different. Digging in the water, due to the impact of currents, the sediment will be automatically backfilled, coupled with poor visibility, underwater archaeological operations are more difficult. In order to solve the problem of automatic backfilling of quicksand, the archaeological team took the method of extracting the excavated sediment immediately, and repeatedly screened the sediment collected each time to ensure that no cultural relics were missed. In the course of a sand pumping, the archaeological team accidentally discovered many ancient coins. In addition to the "Kangxi Tongbao" and "Qianlong Tongbao" and other Qing Dynasty coins, there are Japan's "Kuan Yong Tong Bao", Vietnam's "Jing Xing Tong Bao", and Spanish silver coins. More than 400 pieces of cultural relics were extracted underwater. During the excavation, the underwater archaeologists found the cabin. The porcelain buried in the silt in the cabin was dense and the number could not be estimated. Before extracting these precious artifacts, the team members took pictures, videos, and drawings of the entire environment, because it is likely to contain important archaeological information. The water extracting speed is slow, and under the action of water pressure, the objects are tightly combined. The players are trying to pick up the artifacts. For example, there is an adsorption between the small bowls. If you pull hard and pull, the bowl is likely to be broken. In this way, the cultural relics were carefully taken out and then slowly cleaned. Under the water, the archaeological team extracted more than 400 pieces of cultural relics including blue-and-white porcelain bowls, plates, saucers, cans, lamp holders and lids. After nearly 200 years of scouring the sea, most of these exquisite crafts have remained at first. In particular, the blue-and-white porcelain with fine texture is not only glazed, but also the color of the tangled flowers on the top is still bright and shining. On these precious blue-and-white porcelains, the archaeological team found that many of them had a bottom, and the year was mainly light, while some belonged to the Jiaqing period. Throughout the archaeological excavation of the "Xiaobai Reef I" shipwreck, the archaeological team's total underwater diving time reached 18,000 minutes. What dangers did it experience during this period? What black technologies are used in underwater archaeology? What secrets can be read in the hull wood of "Xiaobai Reef I"? At the same time tonight, CCTV-10 "The Xiaobai Reef I" underwater archaeology documentary will continue to air, in this episode, all answers will be announced.