"Relaxed, flexible diving holiday in North Sulawesi, Indonesia. 5* PADI Dive Resort Thalassa and her team dives in the Bunaken National Park, Lembeh Strait and Bangka Archipelago. Amazing coral reefs, abundant critters and fish life. The highest diversity in the world ..." 

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Thalassa Dive Center with 37 years of Experience

The well-known PADI 5* Instructor Development Dive Center Thalassa, based in Manado, North Sulawesi was founded in 1996 and has been run since by Simone Gerritsen, a Dutch PADI Course Director and diver for 37 years.

Since April 2013, Thalassa has expanded its service offering accommodation as well, right on the border of Bunaken National Park.


The quality of our PADI dive courses is legendary. We don't take "short-cuts" and your safety and comfort is of major importance to us.

Check out our Dive courses and the E-learning options for your next trip. Besides that we are 100% AWARE of our dive environment and will donate to Project AWARE for every license we issue; getting you a special license card. 

...where guests leave as friends!

Thalassa is known for its personal and specialised service. Because of this we are really proud of our slogan, ”Thalassa Dive Resort... where guests leave as friends!” Whether you would like to dive or snorkel around the islands of Bunaken National Park, the Lembeh Strait or would like to make a trip to the Bangka Archipelago, our team of friendly, skilled and always helpful people is ready to take you.

We are also more than happy to show you the Highlands or Jungle and even if you prefer the hustle of the busy city of Manado; nothing is too much!

New Thalassa shirts & bottles

Have a look at our new Thalassa shirts and bottles here. 

Guinness World Record

Thalassa team guest friends planting corals in front of Manado. Read more & see pictures here

IDC 2017


EFR Instructor 15 & 16 May 2017, IDC 18 May until 3 June 2017, Master Scuba Diving Prep Course 5-8 June 2017, I.E. 11-12 June 2017


EFR 13 & 14 October 2017, IDC 16 until 30 October 2017 (2 days off), Master Scuba Diving Prep Course 1-4 Nov 2017, I.E. 7-8 Nov 2017

Fund Raising Swim

On the 5th of June 2016 at least 40 students and alumni students from the Dive Tourism School in Tongkeina swam from the mainland to Bunaken Island to raise money for the Dive tourism school. Read more here.

Coral Day 2015

The Coral Day 2015 on Bangka Island has again recorded great success. See pictures here.