China deploying 'en masse' underwater drones in Indian Ocean: Report Premium Indian navy ships Shivalik & Kadmatt carrying out Passage Exercise (PASSEX) with Russian Federation Navy (RuFN) ships Varyag, Admiral Panteleyev & Pechenga in the Eastern Indian Ocean Region (IOR). (ANI) . Updated: 31 Dec 2020, 06:02 AM IST ANI China has deployed a fleet of underwater drones called Sea Wing glider in the Indian Ocean Sea Wing gliders can operate for months on end and make observations for naval intelligence purposes Share Via Read Full Story New Jersey: China has deployed a fleet of underwater drones called Sea Wing (Haiyi) glider in the Indian Ocean, which can operate for months on end and make observations for naval intelligence purposes, according to defence analyst HI Sutton.