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Japan-Korea Undersea Tunnel
Map showing the two alignments of the tunnel. Dark Green = Road tunnel, Light Green = Rail/Maglev tunnel.
Line New Main Line, Interregional Connector Line
Location Korea Strait
Status Active
System Federation Rail, National Expressway system
Route National Expressway 1
Start Geojedo, South Gyeongsang Prefecture and Busan, Busan Prefecture
End Karatsu, Saga Prefecture and Fukuoka, Fukuoka Prefecture
No. of stations 3
Owner State Office for Transport
Operator Japan-Korea Tunnel Corporation
Traffic Automotive, Rail
Character Passenger, Freight
Toll 4000¥
Vehicles per day 25,000
Length 475km
Line length 200km
No. of tracks 8
No. of lanes 10
Track gauge standard
Electrified 25 kV AC, 60 Hz overhead catenary
Operating speed 400 km/h (maglev)
260 km/h (conventional rail)
120 km/h (automotive)

The Japan-Korea Undersea Tunnel or JKUT is a tunnel connecting Fukuoka and Busan in the East Asian Federation. It travels under the Korea Strait, spanning a length of almost 200 kilometers in two segments - connecting Busan Prefecture in the South Korea region with Fukuoka Prefecture in the Japan region, by way of Tsushima Island. The tunnel includes ten lanes for automobile traffic, five conventional rail tracks, and three maglev right-of-ways. It carries Federation Rail's Interregional Connector Line for local services and New Main Line long-distance service in the rail portion of the tunnels. The tunnel construction was be a joint project between the Infrastructure Advancement Corporation and Hyasoda Contract Services engineers, architects and construction workers. Infra Corp has designed three rest stops into the design for fuel stations, food and restrooms and a station at the mid point for emergency personnel to respond to tunnel accidents.


The road alignment begins as an extension of the Gyeongbu Expressway travelling underneath downtown Busan. A spur route branches from the main tunnel under the city to start the Busan-Geoje Fixed Link. The main route then proceeds through the beginning of the core tunnel section. The northern rail alignment continues south of Busan Station, entering a tunnel approximately 800 meters south of the station platforms. At the 62 kilometer mark is the first automobile rest station, called the North Rest station. It is equipped with restrooms, vending machines, a petrol station, and a small information center. At the 100 kilometer mark is both the Midpoint Island Rest Station and the Busan-Hakata rail station, containing several amenities for weary travelers. At the 172 kilometer mark is the South Reststation. It is equipped with restrooms, a small emergency care facility, and a petrol station. The southern road portal is in downtown Fukuoka, providing local connections to city streets. The southern rail portal is west of Fukuoka, north of Karatsu City.

Midpoint Island Rest Station[]

The Midpoint Island Rest Station, located on Tsushima, is a traveler's rest area at the midpoint of the tunnel complex. Modeled after the Tokyo Bay Aqua-Line's Sea Firefly rest area, The Midpoint Island Rest Station consists of a small commercial complex and residential area connected to the city of Tsushima for workers of the complex. In addition to travelers' amenities, the rest station is home to a Nagasaki Prefectural Police barracks, a regional fire and rescue service center, and a fully operational trauma center. The Tunnel Center station of the Federation Rail Interregional Connector Line allows workers and tourists easy access to the rest station and the nearby city of Tsushima.


The tunnel is composed of ten distinct bored segments; five for road and five for rail. The rail tunnels used to carry conventional local and through service are equipped with dual gauge track for standard and narrow gauge operations. The tunnel is linked to the Korea Train Express network at its north end and the Shinkansen network at its south end. At the north and south road rest stations are matching rail tunnel stations serving as emergency escape points in the case of an emergency. Each station is equipped with exhaust fans, television cameras, loudspeakers, infrared fire alarm systems, and fire suppression systems.