Pedal across the legendary Kanmon Undersea Pedestrian Tunnel — the only place on earth you can cycle or walk beneath a major international strait, crossing between Honshu and Kyushu under the sea. With a private expert guide, this is a bucket-list crossing unlike any other.
What to expect
Your private guide meets you at the port and escorts you to the Kanmon Undersea Pedestrian Tunnel entrance, where you collect a bicycle and descend to the passage 60 metres beneath the strait. The 780-metre crossing from Honshu to Kyushu is marked by a painted prefectural boundary on the tunnel floor — a genuine 'one foot in each island' moment. Above ground, the guide reveals panoramic strait views and hidden Mojiko laneways. The full private itinerary is customisable around your all-aboard time.
Good to know
The tunnel is open daily 06:00–22:00; bicycle hire costs JPY 20 each way. Confirm your all-aboard time and allow 30 minutes' return to the pier. Pre-book OTOMO directly for the private car and guide package; walk-ins for the tunnel itself cost only JPY 20 but lack any guiding context.