The tunnel was discovered after North Korean soldiers abandoned a probe that triggered a seismic alarm.
It is situated at the eastern end of the DMZ, a different sector from the more famous 3rd Infiltration Tunnel.
The interior of the tunnel was reinforced with concrete to prevent collapse during the excavation process.
The tunnel floor features a dedicated track system installed specifically for the shuttle transport of tourists.
The site is located within a restricted military zone, requiring visitors to present valid identification.
A German Shepherd dog named 'Choco' was utilized by military personnel to help detect the tunnel's entrance during initial explorations.
A memorial hall near the entrance houses equipment captured from North Korean tunnel builders.
The 4th Infiltration Tunnel is an underground passage discovered in March 1990 near the Military Demarcation Line in the Yanggu region. It was excavated by North Korean forces as a clandestine route for potential military aggression into South Korea. The tunnel extends 1,052 meters in length, with a width and height of approximately two meters. Visitors can enter the tunnel via an electric shuttle car that travels into the heart of the structure. It remains one of the few tangible remnants of Cold War-era tensions still accessible to the public in the Civilian Control Zone. The site includes an observation deck providing views of the surrounding mountainous terrain and North Korean border regions.
The outdoor memorial plaza featuring the monument dedicated to the discovery of the tunnel.
Bring a government-issued photo ID, as security checks are mandatory for entry into the Civilian Control Zone.
Dress in warm layers, as the interior temperature remains consistently cool and damp regardless of the season.
Check in at the visitor center early to secure a seat on the shuttle, as peak hours can lead to significant wait times.
Do not attempt to walk into unauthorized areas of the Civilian Control Zone beyond the designated visitor perimeter.
Closed on Mondays and major public holidays; operations may be suspended due to military exercises or security concerns.
Photography is strictly prohibited inside the tunnel; obey all instructions from military personnel.
