The utility reportedly wants to lay a 50km cable from the South Korean city of Busan to Japan's Tsushima Island.

It also wants to build an additional 140-150km cable connecting Tsushima — which lies between the Korean peninsula and the Japanese archipelago — to the western Japanese island of Kyushu.

A senior Kepco executive reportedly told Korea's JoongAng Ilbo newspaper that telecoms magnate Masayoshi Son has met with the Korean utility to discuss the possibility of investing in the undersea cable project.

However,