Lanjing (蓝鲸) is a self-propelled, deep water crane vessel, owned by China National Offshore Oil Corporation (CNOOC), the national oil exploration company of China, through its Hong Kong-listed subsidiary CNOOC Limited.

[6] Built in 2012, it is one of the six large crane barges owned by COOEC and CNOOC, namely HYSY201, HYSY 202, Lanjing, Blue Xinjiang, Binhai 109, HYSY286, HYSY289 and HYSY291.

[10] Subsequently, she was purchased by CNOOC and COOEC, and converted into a large crane vessel.

[11] Equipped with a large 7,500 tonnes lifting capacity crane, an additional 4,000 tonnes crane and an auxiliary 1,600 tonnes hook, a long stinger[12] and extensive equipment for lifting and lowering exceptionally heavy equipment and oil rigs, Lanjing is the largest crane vessel in the world (as of 2019).

[13] It has been engaged in numerous projects across the world, including installing some of the largest oil rigs in the world, building some of the largest bridges off the coast of China, and laying sub sea oil pipelines as well as installing offshore structures in the South China Sea and off Myanmar (Zawtika).