A cable ship lays a three-core submarine cable in Shengsi county of Zhoushan, East China's Zhejiang province on Nov 9. [Photo/WeChat account: zsgd93] 

A 33-kilometer, 110-kilovolt three-core submarine cable was laid in Shengsi county of Zhoushan, East China's Zhejiang province on Nov 9. 

The cable, which is the longest of its kind in China, is expected to provide electricity for 400,000 households per day, according to authorities. 

The laying of the cable was carried out by a vessel that can adjust the excavation and burial depth based on the topography. 

State Grid Zhejiang Electric Power Co Ltd Zhoushan Power Supply Company also used China's first underwater detection platform to conduct real-time monitoring during the cable laying process.