BEIJING - China's manned deep-sea submersible Jiaolong and research vessel Dayang Yihao (Ocean No 1) are set to complete major upgrades in preparation for deep-sea exploration missions this year, according to the country's oceanic affairs administration.

Jiaolong, named after a mythical sea dragon, is capable of diving to depths exceeding 7,000 meters. The China-made underwater ship has explored waters in the Pacific Ocean, Indian Ocean and Atlantic Ocean.

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Its upgrades are currently in progress, and technicians have already completed major enhancements to its critical components, including the lithium battery system.

The sea dragon-inspired submersible is scheduled to undergo tank tests in February and sea trials in the South China Sea in March.

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Major upgrades on Ocean No 1 include the installation of remotely-operated underwater vehicles, which will enhance its capabilities and provide reliable support for future deep-sea resources survey and development, said the administration.

Ocean No 1 is China's first modern comprehensive ocean-going scientific research vessel. With over four decades of service, it has conducted 27 oceanographic scientific expeditions.