Don't make nonsense here. The project of HY 981 was administrated by China National Offshore Oil Corporation (CNOOC, NYSE:CEO), designed by China Shipbuilding Industry Corporation, No. 708 research institute, built by Shanghai Waigaoqiao Shipbuilding Co.. It was part of China's high tech plan--"863" plan initiated in 1986. A lot of R&D resources were injected into this HY981, the accumulated R&D cost of this ship may be more than the money that vietnam spent on R&D in the whole country combined each yr.
Haiyang Shiyou 981 - Wikipedia, the free encyclopedia
A lot more detailed info on the R&D units for this HY 981, in Chinese:
海洋石油981深水半潜式钻井平台_百度百科
Your Viets are always genius, in the way that you guys can always come up with fabulous high tech marvels with close to zero spending on R&D, you are so efficient.