The Tokyo-based company had been planning to start testing the Skwid off the coast of Saga prefecture, on the southern Japanese island of Kyushu, from late last week.

However, the prototype’s marine turbine component sank on 12 October off the northern coast of Kyushu while being towed by barge from Kagawa prefecture, on the adjacent island of Shikoku.

The demonstration scheme was expected to take about a year.

Modec