■ Did You Know You Can Walk Under the Sea?

The Kanmon Strait separates Moji in Kitakyushu, Fukuoka, from Shimonoseki in Yamaguchi Prefecture. For centuries, this narrow yet historically significant waterway has served as a crucial transportation hub. But did you know that you can walk across the strait—under the sea?

Welcome to the Kanmon Tunnel Footpath, an extraordinary passageway that lets you walk between Kyushu and Honshu beneath the ocean.

Stretching 780 meters (about half a mile) at a depth of 60 meters below sea level, this tunnel offers a rare experience: crossing a prefectural border on foot while submerged under the waves. The unique atmosphere, historical significance, and sheer novelty of the experience make this tunnel more than just a walkway—it’s an adventure.

So, let’s dive into the fascinating world beneath the Kanmon Strait!

■ A Journey Through Time | The History of the Kanmon Tunnel

1. A Tunnel Born from War and Reconstruction

The Kanmon Tunnel opened in 1958, but its story begins much earlier, back in the 1930s. At the time, ferries were the only way to travel between Kyushu and Honshu. However, the Kanmon Strait is known for its strong currents and unpredictable weather, making sea crossings dangerous.

In 1938, construction of the Kanmon Tunnel began as a solution to this problem. However, World War II halted progress, and the project was left unfinished for many years. It wasn’t until after the war, in the 1950s, that the tunnel was finally completed, symbolizing Japan’s postwar recovery and modernization.

2. Why Was a Pedestrian Tunnel Built?

The Kanmon Tunnel actually consists of two separate tunnels: one for vehicles and one for pedestrians. While the vehicle tunnel was essential for connecting the two regions, the government also wanted to ensure that people could cross the strait on foot or by bicycle.

■ The Unique Experience of Walking Under the Sea

1. The Thrill of Walking Beneath the Ocean

Walking into the Kanmon Tunnel Footpath is like stepping into another world.

The air is cool and slightly damp, and the tiled walls create a clean but slightly eerie atmosphere. Unlike other underground spaces, there’s no train noise or city sounds—just the soft echo of footsteps. The deeper you go, the more you feel disconnected from the outside world, making this experience feel almost surreal.

Halfway through, you realize something incredible: you are standing directly beneath the sea. Above you, massive cargo ships, ferries, and even fish are passing through the strait. It’s a moment of quiet awe—an experience that no bridge or ferry ride can provide.

2. Cross a Border with Just One Step!

One of the highlights of the tunnel is the border between Fukuoka and Yamaguchi Prefecture, clearly marked on the ground.

Standing on this line, you can put one foot in Kyushu and the other in Honshu—a fun and unusual experience that makes for a perfect photo opportunity!

Many visitors take pictures here and post them with the hashtag #PrefectureJump, showcasing their unique "one-step border crossing" moment. Whether you're traveling alone or with friends, this is a must-capture memory.

3. More Than Just a Tunnel: A Walk Through History

As you walk through the tunnel, you’ll notice historical panels and photographs along the walls.

These displays offer fascinating insights into:

• The construction of the Kanmon Tunnel

• The history of the Kanmon Strait in the Showa era

• The role of the tunnel during wartime

The tunnel isn’t just a convenient pathway—it’s a living piece of history, filled with stories of perseverance and innovation.

Engineering enthusiasts will also appreciate the tunnel’s ventilation systems and emergency exits, which reveal the advanced technology used to construct this remarkable underground passage.

■ The Kanmon Tunnel Footpath Is a Hidden Gem for Curious Travelers

The Kanmon Tunnel Footpath isn’t just a shortcut—it’s an adventure.

✅ A rare chance to walk under the sea
✅ A unique opportunity to cross a border on foot
✅ A historical landmark with a fascinating backstory

Despite its uniqueness, the tunnel remains a hidden gem, often overlooked by travelers. But for those who take the time to visit, it offers a one-of-a-kind experience that blends history, engineering, and a sense of exploration.

Next time you find yourself in Kitakyushu or Shimonoseki, don’t just look at the sea—walk beneath it. The Kanmon Tunnel Footpath is waiting to take you on a journey like no other!

■ Spot information

Address: Moji-ku, Kitakyushu-shi, Fukuoka 801-0855

Phone number: 083-222-3738

Business hours: Open from 6:00 to 22:00

Closed: No holidays

Fee: Free for pedestrians, 20 yen for bicycles and mopeds

Light vehicles must be pushed along.

Parking: Yes

Access information: Nishitetsu Bus “Kanmon Tunnel Humanitarian Exit” is close by.

Website: Click here for related sites

Click here for a special page showing the attractions of Kitakyushu City.