Chinese research ship Haiyang Dizhi-9, or Ocean Geology No 9, returned to port in Qingdao, East China's Shandong province, on Friday.
TÜV Rheinland Group, the largest energy group in Europe, and Shandong Shipping Corporation signed a long-term leasing agreement for ten 180,000-DWT dry-bulk vessels in Qingdao on Nov 15.
China's first undersea tunnel for a subway employed advanced technologies and machinery to combat complex geological conditions.
Ocean expedition tasks could be time-consuming and arduous, but that was not the case for researchers on the vessel Kexue, whose name means science in Chinese, which had just accomplished a scientific research mission and returned to Qingdao, Shandong province, on Monday.
China announced Tuesday that construction has finished on its deepest undersea subway tunnel on the mainland.
A recently concluded China-Russia joint Arctic expedition has yielded a more comprehensive and systematic understanding of the Arctic Ocean that will provide scientific support for the development of a Polar Silk Road, scientists from the two countries said on Tuesday.
Yantai-based CIMC raffles signed a deal with Bohai Ferry Group in an attempt to cooperate in developing multi-function ro-ro (roll-on roll-off) vessels on Oct 23.