Sightseeing Tour on a Semi-Submersible Boat in Ainan, Ehime


A boat and submarine hybrid, semi-submersible boats offer a glimpse of the world underwater that’s usually privy to only snorkelers and divers. In Ainan, Ehime, board one of these unique boats and explore the waters of Ashizuri-Uwakai National Park!


  • Get the “submarine” experience on a special semi-submersible boat
  • Explore the wonders of the world underwater while staying fully dry
  • Enjoy an up-close look at the diverse marine life in the waters of a national park that’s known for its rugged coastline
  • Suitable for all ages — no need to learn to dive or snorkel; just board the boat and enjoy!

Important Information

- The tour may be canceled in case of inclement weather or rough sea conditions. In the event that this happens, we will contact you on the morning of the tour to refund or reschedule - The interior of the boats, including the stairs leading to the cabin, are narrow. This tour is recommended for people who have no trouble walking on their own - Please arrive 15 minutes before your timeslot for registration - Please understand that in booking this activity, we may share your booking information (but without individually identifiable data) to the Ministry of the Environment, with which this activity is affiliated. By making a booking, you signify that you agree to these terms.


Go underwater and explore the stunning wonders of the sea in Ashizuri-Uwakai National Park — while staying completely dry! On this sightseeing tour in Ainan, Ehime, you’ll cruise the ocean on either of two special semi-submersible boats: ‘Yumekaina’ or ‘Gaiyana.’ From within the boats’ underwater observation rooms, you’ll be able to get an up-close look at the colorful corals and fascinating aquatic life in the ocean. Observe a beautiful coral reef and watch colorful tropical fish swim past right in front of your eyes. If you’re lucky, you may even get to see schools of sardines or a sea turtle! The tour lasts for approximately 40 minutes, with hourly timeslots available from 09:00 to 16:00. Please arrive 15 minutes before your timeslot for reception.

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