The “Haiyang Dizhi 2 (Ocean Geology 2)” research vessel, constructed by CCCC Fourth Harbor Engineering Co., Ltd. of China Communications Construction Company Limited, completed the world’s first ignition of deep-sea combustible ice (methane hydrate).
Launched in April 2022, the research vessel measures 85 meters in length, 22 meters in width, and 8 meters in depth, with a displacement of 7,224 tons and a range of 12,000 nautical miles. It also serves as a support ship for China’s first independently designed deep-ocean drilling vessel, “Meng Xiang”.
“Haiyang Dizhi 2” research vessel is equipped with advanced technology devices such as a 150-ton active heave compensation offshore crane, a 10-kilometer fiber optic winch, and a geological winch. Its 730-square-meter deck and helicopter platform enhance operational efficiency and equipment utilization.
The “Haiyang Dizhi 2” research vessel was operating to ignite the combustible ice in the deep sea. [Photo/sasac.gov.cn]
The vessel arrived at the targeted sea area on September 18. It deployed the “Haima” ROV (a 4,500-meter deep-sea remotely operated vehicle) to the cold seep leakage site at 1,522 meters deep. Researchers used the robotic arm to hold a collection chamber, collecting flammable ice and associated gas seeping from cold seep vents. The dormant flammable ice became active under depressurization, and released methane gas. Subsequently, the photovoltaic power generation device on the deck converted solar energy into electrical energy, which was used to ignite the methane. Finally, the “Haima” ROV returned to the deck with a stably burning flame.
The operation’s success is built upon marine geological researchers’ efforts in studying combustible ice for almost 30 years. The research vessel also served as a highly effective and reliable platform.
(Executive editor: Yuan Ting)
