China's largest self-propelled vessel, named Tian Kun Hao, returned to Qidong Shipyard in Jiangsu Province after its first trial voyage, reports Xinhua News Agency.

中国最大的自航绞吸船天鲲号首次试航结束已返回江苏启东船厂。

The ship, which is owned by China Communications Construction Company, was launched in October. It then started a month-long test of its automated dredging system, which it passed with flying colors.

It took the ship's owner five years to develop a stable and high-efficiency dredging process, which the ship can manage automatically.