Marine House Seasir
マリンハウスシーサー26°15′ N 127°41′ EDiveEnglish spoken
Marine House Seasir runs Kerama day dives from its Naha shop for ¥22,800 (2026–27 rate) and dive-and-stay packages at its Aka Island base, and both branches close for part of winter 2026–27; the company began on Aka in 1983 and calls itself Okinawa's largest diving company.
Photo Enoch Leung from Canada · Wikimedia Commons · CC BY-SA 4.0
Seasir began as a small shop on Aka in July 1983 and now calls itself the largest diving company in Okinawa. The Naha branch sits by the port in Minatomachi, collects divers from hotels around the city, and runs to the Kerama National Park in 40 minutes to an hour depending on the first site. A day out means two dives before a boxed Okinawan lunch, with a third on offer in the afternoon and a hot shower on board before the run home.
The Aka branch suits divers who want to wake up in the Keramas. Its packages bundle rooms, two meals and the dives, and you buy your own ferry ticket from Tomari. Staff on Aka speak basic English, and the Naha office has instructors who teach PADI courses in English and Chinese. Check the closure dates before you plan a winter trip around Seasir, because both branches take a long break between December and February.
What they offer
| Offering | From | Duration | Months |
|---|---|---|---|
| Kerama full-day leisure dive from Naha, two divesRate for 1 April 2026 to 31 March 2027. Three dives cost ¥29,400; with a full rental set ¥28,300 for two dives and ¥34,900 for three. Includes guide, boat, tanks, lunch box, drinks and Naha hotel transfers. | ¥22,800 / person | 9 hr | Year-round except temporary closures (1–23 December 2026 and 4 January to 28 February 2027) |
| Aka Island stay with two dives (one night, breakfast and dinner)Rate for 1 April 2026 to 31 March 2027, twin or triple Western-style room. You book the ferry to Aka yourself. Two nights with two dives from ¥55,000; three nights with four dives from ¥93,500. | ¥38,500 / person | 2 days | Year-round except 12 January to 9 February 2027 |
| Optional third divePaid at the shop on either branch's trips. | ¥6,600 / person | – | – |
| Kerama introductory dive or snorkelling from NahaRun by the sister shop Marine Club Berry Naha. Snorkelling takes children from age 6. Prices are on the Berry booking pages, which we did not read. | – | – | – |
FAQ
Quick answers about Marine House Seasirよくある質問
Is Seasir open for diving in February 2027?
Yes. Seasir Aka reopens on 10 February 2027 after a closure that starts on 12 January. Seasir Naha runs no dive trips from 4 January to 28 February 2027.
How much is a Kerama dive day trip from Naha with Seasir?
Seasir's Kerama full-day leisure dive from Naha costs ¥22,800 for two dives and ¥29,400 for three, at its rates for 1 April 2026 to 31 March 2027. The price includes hotel transfers in Naha, the boat, tanks, a guide and a lunch box.
Does Seasir refund trips cancelled for weather?
Yes. Seasir says it refunds any tour it cancels for weather or sea conditions. When it can, it switches to a sheltered destination and tells guests the day before.
Does Marine House Seasir speak English?
Yes. Marine House Seasir works in Japanese and English and Mandarin and Cantonese and Korean.
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