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Dive in - explore our world.


Koh Changs boutique diving center.

We are a small independent dive center, focusing on safety & quality, in the mix with the highest quality equipment in the industry. We tailor make each course and/or dive experience to measure. All of our equipment is either brand new or from this season - it will never exceed 12 months old. We promise you an extremely exciting, invigorating and personal once in a lifetime experience. Dive into our world and discover your next adventure.  With so many ways to learn and advance, Siam H2O provides you with more options & more choices, plus a down to earth, personal and unique experience. 

Welcome to the family, welcome to SIAM H2O


SSI - Scuba Schools International


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SSI - The Ultimate Diving Experience.

You never need it - until you need it, and then it’s too late. Don’t take chances!

A tailored approach to each and every individual.

We are a fully committed Scuba Schools International Dive Center, although our instructors are dual rated with SSI & PADI. We have a systematic, yet tailored approach to each and every student, diver and course. Thankfully, no two individuals are the same, therefore, we approach each and every person individually - and according to your learning/diving needs and aspirations. We offer you a continued support network throughout your recreational diving hobby & career.

By becoming an SSI diver with Siam H2O, you will earn a globally recognized diving certification, have access to superior educational materials, state of the art media tools, more time in the water with your instructor and the worlds most superior and progressive advancement program. Most of all, you will have fun whilst earning your certification and learning your new adventure sport!



Lunch included. Always.

Diving can be physically demanding, so, our Decompression Cafe has put together an extremely tasty lunch menu with locally sourced ingredients for you to enjoy whilst out on the ocean.  It is a simple menu, however, again, it is original and packed with creativity, goodness and oozes essential health elements to keep you going through the day. 

The Decompression Cafe also serves breakfast every day until fresh produce is finished. Whilst here, don't miss our "5 a day" shake, it's a fundamental "foodness goodness!" Our local access to tropical fruits has reinforced our reasons to make this one. Mango, Pineapple, Coconut, Passion Fruit and an assortment of berries. Seriously, luscious.

SSI Certified.

We are proud to be a certified SSI diving center. For more than 40 years, SSI has provided training, scuba diving certification, and educational resources for divers, dive instructors, dive centers and resorts around the world. Started in 1970, SSI has expanded to include more than 30 Service Centers, is represented in more than 110 countries with over 2.500 International locations, and has materials printed in more than 30 languages. SSI is clearly the name to trust in the diving world, and we attribute that success to our uncompromising standards and focused methodology. 


You want it - we've got it!

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Pick-up, free of charge.

Whether on a course or fun diving, we have your safety as priority number one. To this end, one of our staff will collect you in the morning and return you to your residence at the end of the activity. After spending a whole day underwater you're probably exhausted, good to know then that the ride back home is on us too, free of charge.