Oosekan Marine service started its service here at Osezaki for over 30 years.Mr. Yasuda, the owner of Oosekan (Accommodation) and Oosekan Marine Service, with the passion to introduce this special diving area to the whole of Japan, worked hard to make Osezaki into one the best diving area in the whole of Japan.

Now Oosekan Marine service with joint effort with NPO Japan Diving Experience would like to introduce this special diving destination.Oosekan Marine Service is located right in from of the Inner Bay. You can gear up and walk 30m to the entry point. The Service Supervisor Mr. Kumagai, although still young, has extensive knowledge and skills of guide you to the rare macro world of Osezaki. With his professional team of guides, they will surely make your visit here a worthwhile experience.

After each dive, you can jump into the hot tub with your wet/Dry suite to warm yourself quickly or take a hot shower located in the service. *Hot tub prepared during weekends during the autumn to spring months.Due to high demands by amateur and professional underwater photographers, camera related facilities offered here are extensive.

Due to the traditional style accommodation offered at Oosekan, you can enjoy the both diving and accommodation with the dive accommodation package offered. The dinner package offers delicious seafood Japanese dishes, including “sashimi” of the freshly prepared local fishes.

Opening hours: 08:00-17:00 (Saturday/Sunday/Public Holidays Open from 06:30)  ※On Night diving operating day Open to 21:30)

【Note from NPO】
On the day of Diving, the Diving Shop will have limited English available.
 But please don't be alarmed. NPO will assist regarding prior questions and enquiry for your booking. We will advise you how your diving will be on the day. The Guide will communicate with you using translation application on land and during your dive, sign language with will be reviewed before your dive.