The Team

Simone Gerritsen

Managing Owner

Simone is a PADI Course Director with over 40 years of underwater experience and the “face” of Thalassa. Known as Ibu to most locals, Simone puts all of her energy into education and getting the best out of people.

Jacob Kaleb


As well as responsible for our boat operations, Jacob oversees any construction needs we might have. Under his supervision, Thalassa Lembeh was built at a pace that would put Superman to shame and hang up his cape.

Yuswaning Asri


When it comes to financial matters, Sri has got the numbers down to a tee. Besides that, she enjoys making sure our guests are comfortable and have everything they need.

Satoka Kubo


Hailing from Kyoto, Japan, Satoka is a PADI Instructor and diving operations manager. “Toka” is happiest underwater, guiding our Japanese and Korean guests on their diving adventures.

James Pasinaung


From contracts with local governments, paperwork and red tape, to staying permits and work permits, all of these are James’ specialty. That, and making really, REALLY bad jokes.

Arjen Bokhoven


Graphic designer by trade, Arjen works at Thalassa to give the company a face to the outside world, both on- and offline. He tackles anything from website work to our marketing campaigns.