Introduction to the Second Sea Fort | Second Sea Fort Tours and Travel

If you're planning a trip or tour to Daini Kaiho, choose Club Tourism! We introduce a tour that lands on the artificial island "Daini Kaiho" floating in Tokyo Bay. With a tour conductor, you'll be well-supported.

What is Daini Kaiho?
Notes

What is Daini Kaiho?

Daini Kaiho was one of three sea fortresses built for the purpose of defending the capital from the Meiji to Taisho periods.
Many of the batteries were destroyed in Kanto (1923), and it lost its function as a fortress. Currently, landing on the island is prohibited for the general public, but
The general public has been allowed to land since May. While individuals are still prohibited from landing, only travel agencies are permitted to land.

Daini Kaiho Island

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Island brick wall

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Notes

If a boat is cancelled due to bad weather, the decision will generally be made the day before. In the unlikely event that the boat is cancelled, the tour will be cancelled.
*Please note that as this is a national facility, it may suddenly become impossible to land on the island. The procedure will be the same as for cancellations due to bad weather, as described above.
For safety reasons, we ask that children under elementary school age not participate.
Elementary and junior high school students must be accompanied by an adult.
The inside of Daini Kaiho has not been developed for tourism. Please wear comfortable clothes and shoes as you will be walking along slopes and unpaved roads. Please refrain from wearing high heels or sandals.
Please note that if the captain of the boat determines that it is difficult for people with disabilities, such as those using walking sticks, to disembark, you may be asked to wait inside the boat.
There are no restrooms on Daini Kaiho. However, as the number of restrooms is limited, please use the restrooms at the boarding area.