The Team

PADI Course Director Simone Gerritsen

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.

Jakob Kaleb, construction supervisor

Jakob 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.

Sri Yuswaning, finance

Sri Yuswaning


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, instructor & guest relations

Satoka Kubo

Guest Relations

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, general affairs

James Pasinaung

HRD & General Affairs

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, marketing design

Arjen Bokhoven

Marketing Design

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.