Fushin-sen

This list describes a fushin-sen/suspicious ship that maybe of North Korean origin. The following features can be mentioned as points of focus for discovering about fushin-sen/suspicious ships:[6]

Anti-aircraft cannons from the Battle of Amami-Ōshima fushin-sen. Having heavy anti-aircraft and/or anti-tank weapons aboard is one of the signs of a fushin-sen type of ship.

• Disguised as a Japanese or Chinese fishing vessel. Alternatively, a North Korean cargo ship may be used as a one.
• Equipped with a large number of antennas, such as shortwave radios, that improve signal of wireless equipment.
• The radar installed on the mast may be set higher than a normal fishing boat to quickly detect the approach of Japanese navy vessels and/or fishery patrol boats and take evasive action.
• No fishing gear is mounted on the bow, or even if it is mounted, there is no evidence that it has been used.
• Inside the ship, there is a small high-speed boat for landing that looks like a small fishing boat that is often seen in the coastal areas of Japan, and there is a door at the stern for putting it in and out. On the other hand, when infiltrating South Korea, a special boat called "semi-submersible" will be installed. This is because in South Korea, if a suspected spy ship attempts to escape, the ROK Navy will sink the suspected ship as well as the suspect.
• The lights are completely turned off, and the operatives try to smuggle in from the beach, which is hidden in the darkness. Alternatively, berth the ship at a fishing port in a depopulated area so as to avoid the public eye.
• Weapons are hidden inside the ship. An investigation into the North Korean vessel used in Spy Ship Incident in the Southwest Sea of Kyūshū revealed that it was equipped with a large number of weapons, including anti-aircraft weapons and anti-tank weapons.
• It is equipped with a powerful diesel engine introduced from other countries such as Russia, and has 10 times the horsepower and twice the speed of fishing boats of the same type. This enables high-speed navigation equal to or higher than that of warships. However, when a research team at the Japan Coast Guard Academy inspected a suspicious ship that was pulled up during the Battle of Amami-Oshima in the southwestern part of Kyushu, it seems that the speed will drop significantly in bad weather with a wave height of 3 meters or more.
• In order to accept operatives and smuggled goods, the base person (North Korean contact) may board a vehicle such as a rental car on the beach at midnight and communicate with a suspicious ship offshore by a light emitting signal or a mobile phone. In particular, it is said that freight vehicles such as cold storage vehicles and aluminum vans are preferred as vehicles that are convenient for accepting multiple smugglers and transporting stimulants.
• There is also possibility that legally recognized North Korean cargo ships and ferries maybe used as fushin-sen. One such example has been the Man Gyong Bong 92.[7][8][9]

(December 4, 1959) The South Korean government conducted a joint return project for Koreans in Japan with the Japanese Red Cross Society, in response the North Korean government and Koreans in Japan jointly carried out terrorist activities, such as the bombing of trains and ships in Japan and the abductions of important people.

(August 8, 1973) An incident in which Kim Dae Jung, who was staying in Japan, was abducted by an agent of the Korean Central Intelligence Agency and a Korean resident in Japan, and was taken to South Korea by a craft.

(March 23, 1999) A ship believed to be a North Korean craft ship appeared off the Noto Peninsula in the Sea of Japan, and was tracked by the Japan Coast Guard and the Maritime Self-Defense Force. For the first time, the Maritime Self-Defense Force was issued a maritime security action, which is a de facto actual battle order (security operation). As a result, the craft ship was missed, but this incident triggered the realization of hull shooting and the maintenance of patrol boats due to the revision of the Japan Coast Guard Law, and the formation of the Maritime Self-Defense Force's Special Boarding Unit and on-site inspection team with escort vessels.

The ship used by North Koreans during Amami-Ōshima exhibited in the Yokohama marine disaster prevention base.

(December 22, 2001) A North Korean craft ship appeared in the East China Sea off the southwest coast of Kyushu, and was tracked by the Japan Coast Guard and the Maritime Self-Defense Force. After pursuing, a cornered craft ship shoots a Japan Coast Guard patrol boat. A patrol boat was hit and three coast guard officers were injured. The patrol boat immediately carried out self-defense shooting, and it became a shooting battle. The craft ship self-destructed during the shootout and sank in an instant. At this time, all the operatives died.

• Suspicious ship off the coast of Kaga City (July 31, 1971)
• Hyuga Nada Suspicious Ship Case (April 25–27, 1985)
• Suspicious Ship Case in Central Sea of Japan (September 4, 2002 – September 5, 2002)
• Mihama Incident (October 28, 1990): An incident in which a small boat for landing was washed ashore on the coast of Mihama-cho, Mikata-gun, Fukui Prefecture (see the external link for details).
• North Korean semi-submersible sinking incident (December 18, 1998): A suspicious ship found by South Korean coastal guards invading South Korean waters goes to Tsushima, Nagasaki Prefecture to escape the pursuit of the South Korean Navy. When the South Korean Navy was pursuing the invasion, an incident occurred in which it was sunk on the open sea 70 km off Tsushima. A later pull-up investigation revealed that the suspicious ship was a North Korean semi-submersible. Until March 1999, the Japan Coast Guard strengthened vigilance off the coast of Tsushima and provided crime prevention guidance to residents of Tsushima and the Goto Islands.