What happened to the Buddhist scriptures in Mogao Grottoes?

On May 26th, 26th year of Guangxu reign in Qing Dynasty, the Taoist King of Mogao Grottoes was supervising the workers to clean the tunnel of Cave 16, when suddenly "there was a hole in the wall, as if there was something special". After excavation, it is found that there is a Tibetan sutra cave with a height of 18m and a width of 0.8 ~ 0.9m in the north wall, which contains collections from the first year of Ganlu in the former Qin Dynasty to the second year of Qingyuan in the Southern Song Dynasty. Based on this, it can be inferred that the stone chamber was closed at the beginning of13rd century when Yuan Hao, the king of Xixia, attacked Dunhuang. Monks in Mogao Grottoes hid these precious Buddhist scriptures, documents and works of art in the stone chamber during the war. These collections include Buddhist, Taoist and Confucian classics, poems, songs and other folk documents, local chronicles and household registration documents, as well as more than 50,000 important cultural relics such as embroidery and utensils, covering religious, political, military, economic, cultural, literary, artistic and daily life fields. In addition to Chinese materials, there are a large number of Tibetan, Sanskrit, Khotan, Kucha, Uighur and Turkic languages. The discovery of the Tibetan Sutra Cave has attracted the attention of foreign archaeologists with the word of mouth of Silk Road merchants. Since 1907, British Stein, French Pelliot, Japanese Yoshikawa Koichiro and Zuicho Tachibana, Russian Odenburg and others have sneaked into the Mogao Grottoes, bribed greedy and ignorant Taoist priests with petty profits, or directly taken away tens of thousands of rare treasures. At present, most of the cultural relics found in the Buddhist scriptures of the Mogao Grottoes are scattered in the libraries of Britain, France, Russia, Japan and other countries. 1in March, 943, under the cry of Yu Youren, who was in charge at that time, Dunhuang Art Research Institute was established to carry out the preliminary maintenance and arrangement of cultural relics and grottoes. 195 1 year, the Dunhuang Cultural Relics Research Institute was reorganized, and the Mogao Grottoes Construction Committee also conducted a detailed survey of the grottoes. 196 1 year, the Mogao grottoes were listed as key cultural relics protection units, and comprehensive maintenance began. The plank roads in the north and south areas have been strengthened, sand-proof walls have been built, and cave doors and electric lighting equipment have been installed. New discoveries have been made in the arrangement and research of cultural relics in Mogao Grottoes, and domestic experts have published important works one after another. Nowadays, the Mogao Grottoes are gradually known and become a tourist attraction, and Dunhuang studies have also become an internationally recognized school.