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Sea Wing

The Haiyi [海翼] (or Sea Wing) is the name of a torpedo-shaped underwater autonomous vehicle developed by China's Academy of Sciences Institution of Oceanology. Like other underwater gliders, Sea Wing moves through the water using a buoyancy compensation system filled with oil. Produced by a Shenyang robotics laboratory, Haiyi is two meters in length and weighs 65kg.

"Since there is no power propulsion, the acoustic signature is extremely low. That characteristic suggests that [this platform] can have great significance for the military domain," wrote the Chinese defense magazine, Ordnance Industry Science and Technology (兵工科技).

Deployment timeline

2003: Project initiated
2005: Prototype completed
2012: Extended test around Dongsha [东沙] islands in the northeastern South China Sea
2014: Completed a 30-day test in the South China Sea totalling 1022.5 kilometers.
2017: The research vessel, "Kexue" deployed 13 in the East China Sea, South China Sea and other waters of the western Pacific to complete observations of ocean phenomena including the Kuroshio Ocean Dynamic Processes spindle, eddies, and Nanhai Xi boundary flow ^[1]. The Kexue is China's most advanced, independently-made marine science expedition vessel. It was put into operation in April 2014. The 4,711-tonne vessel is capable of conducting deep and open sea exploration and research.
2019: Deployed in the Indian Ocean Region (IOR) launched by the specialist survey ship Xiangyanghong 06. The mission was the winter survey for the Joint Ocean and Ecology Research Project run by the Ministry of Natural Resources.

Additional references: - Explanation of the buoyancy compensation system ^[2]

^ O'Connor, Tim. "China's Military Could Leave the U.S Navy Dead In The Water With New Sea Drones". Newsweek. Newsweek. Retrieved 24 March 2020.
^ Petritoli, Enrico (17 April 2019). High Accuracy Buoyancy for Underwater Gliders: The Uncertainty in the Depth Control. Switzerland: MDPI. Retrieved 24 March 2020.

[1] O'Connor, Tim. "China's Military Could Leave the U.S Navy Dead In The Water With New Sea Drones". Newsweek. Newsweek. Retrieved 24 March 2020.

[2] Petritoli, Enrico (17 April 2019). High Accuracy Buoyancy for Underwater Gliders: The Uncertainty in the Depth Control. Switzerland: MDPI. Retrieved 24 March 2020.

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