with Hydronauts

Are you interested in having a career as a professional scuba diver? Do you need a good reason to spend a few months on a tropical island? Look no further than the Hydronauts Divemaster Course. 

Divemaster Training

Earning a Divemaster certification is the first step towards your new career as a professional scuba diver. Unlocking the freedom and ability to dive anywhere in the world is a massive perk. Throughout your training, you will learn how to properly deliver dive briefings, lead certified divers around Koh Tao dive sites and how to DEFY GRAVITY like a true Hydronaut. You will practice with fellow Divemasters Trainees (DMTs) role-playing as customers or dive lead to build your confidence both in and out of the water. This will better prepare you for when the time comes for real-world experience. Keeping guests safe, informed, and fascinated by the underwater world is our top priority and we do our best to pass this on to our Divemasters in training. 

Unique Experience

Becoming a RAID Divemaster at Hydronauts is a unique experience not offered by many other dive centers. Not only will you gain professional-grade knowledge and practical use of diving theory, equipment, and safe diving practices, but you will also be using state-of-the-art equipment and will be trained to the highest industry standards. Our program is also designed with the community in mind. Your two-to-three months in the Divemaster program has options to integrate your blossoming diving knowledge into the daily operations of Hydronauts Diving Resort, working with crew and customers. This real-world firsthand experience working in a dive center resort offers a unique qualification for a successful future in the industry. 


Furthermore, the Hydronauts Divemaster Program can be completed in as little as 6 weeks but we highly recommend to join us for the 8-week curriculum. You will be working closely with our Divemaster Training Instructor, James Lee. On the days you’re not doing specific coursework, you are free to go diving with the other Divemasters on our twice-daily boat trips.


Is coral restoration and conservation your passion? Hydronauts also has an integrated partnership with Global Reef, a marine ecology and conservation education program. Global Reef is led by world-renowned marine biologist and underwater photographer, Piers Baillie. If you would like to spend an extra month working with Piers and contributing to some ongoing reef health and fish population studies, be sure to add a Conservation Internship to your Divemaster program. Get in touch with us to learn more today!


Want to live on the beach during your training? We offer accommodation packages to our Divemaster Trainees who would like to stay at our beachfront resort. 

Starts at 38,000 THB


Must be 18 years of age minimum. 

Must be a certified Master Rescue Diver and have a current First Aid & Oxygen Provider certificate. 

Prior to Divemaster certification, candidates must acquire Nitrox, Deep 40 as an exit requirement which can be completed before or during the Divemaster program.

Have a minimum of 45 logged dives using open-circuit.

Have a logged navigation, night or limited visibility dive.

Have a recent medical certificate from a medical professional stating you are fit to dive.


Within your Divemaster you will complete your online E-learning modules, including quizzes, presentations and your final exam. You will learn how to plan and execute a dive and which factors to consider when doing so.

You will complete various skill sets both in and out of the water, until you have shown you are competent in all aspects. The Divemaster qualification also requires a set amount of time spent assisting instructors and their students on recreational courses. Course assisting is extremely beneficial, especially if you are planning on working in the scuba diving industry yourself.

The whole program requires a minimum of 40 hours theory and practical work to complete. Depending on your time scale it is also possible to extend this period if you wish and take your time to ensure you are confident with all you have learned and most importantly – enjoy yourself!


Flying after your dives? Be sure to give yourself an 18-hour window after your final dive.

Need a place to stay? We are a beachfront diving resort! We offer rooms from mixed dorms, double bed rooms, family rooms, and bungalows for weekly or monthly rent! You can book a room here

Please keep hydrated. Remember to drink plenty of water before and after your dives.

Bring sunscreen (preferably reef safe) and apply it an hour before entering the sea to protect marine life.

Why Choose Hydronauts?​

RAID Instructors​

Our experienced instructors are hand-picked, highly trained, and passionate about scuba diving. We tailor each course and dive to your unique needs.

Beachfront Diving Resort​

Southwestern-facing property including a dive shop, hotel, training pool, cafe & restaurant, dive boat, and beach bar. We offer diving & accommodation packages for every budget.

Guaranteed Small Groups

We guarantee small groups of no more than four students to an instructor or dive guide so that you get the individual attention you deserve.

State-of-the-Art Equipment

We choose to dive and teach in Backplate & Wing BCD with a Long-hose, Short-hose regulator configuration favored by technical divers.

Dive Anywhere in the World

Upon completion of your RAID scuba diving course, you will be issued with an e-certification card that recognizes you as an internationally certified scuba diver.

Low Carbon Footprint

We make every effort to reduce our footprint and use of paper and plastic. All our course materials are hosted online giving you access for life.

Reserve your space now


No such thing as a stupid question, only the ones not asked!

Yes! We are a 3-star beachfront resort with a wide variety of room options. Our dorm rooms start at 280 THB and private accommodation starts at 500 THB. Message us and ask about our diving and accommodation packages today. 

Yes! You can begin your reading and quizzes before you get here but you will need to complete the workshops and exams with your instructor when you arrive. Contact us now to get started.

Explorer 30 is the next course we recommend after your Open Water 20 Course. This course will focus on improving your buoyancy, advance your understanding of dive planning, and allow you to dive on shipwrecks, deep sites, and maybe even diving at night. Get in touch with us to learn more.

Yes. All the answers are in the manuals for you to review anytime. Our approach to education is for students to comprehend and practice through repetition rather than focusing on textbook memorization. This ensures that your actions are informed and contextual. 

Yes! Check our Try Dive page or get in touch with us to learn more. We can’t wait to show you the underwater world and teach you to defy gravity.