Beijing, November 19 (Youth.cn) - China's first domestically built ocean drilling vessel - Mengxiang - was commissioned on November 17th, marking a major leap in the nation’s deep-sea exploration and mining endeavors. One of the key technological innovation projects of the “14th Five Year Plan”, it is able to drill as far as 11,000 meters beneath the sea. It is a drilling vessel with the strongest drilling capacity, the most complete scientific experiment function, the most intelligent and the lowest maintenance cost in the world. Photo/VCG