The government will use an underwater camera next week to investigate an unidentified ship that sank in December in the East China Sea after exchanging fire with Japan Coast Guard vessels, transport minister Chikage Ogi said Friday.

Land, Infrastructure and Transport Minister Ogi announced the five-day investigation plan starting Monday at a news conference after a morning Cabinet meeting.

According to the coast guard, its survey ship the Kaiyo, towing an ultrasonic probe, will locate the ship, which is believed to be lying on the seabed 90 meters below the surface about 390 km west of Amami Oshima island.