Deep 40

with Hydronauts


Deep 40 is a specialty course that certifies you to dive to 40 meters. The course develops the knowledge required to plan, prepare, and execute a deep dive by understanding and mitigating the risks. 

On its own, Deep 40 is a 4 dive, 2.5-day course. The course can, however, but can be combined with or shortened if you are already an Advanced, Explorer 30, or Advanced 35 diver. 

We recommend combining the Nitrox course with the Deep 40 specialty.

8,500 THB


Must be 15 years of age or older.

Must be a certified Open Water diver.

Must have a minimum of 8 hours logged underwater in an Open Water environment.

Step 1 -
Online Study

Begin your e-learning before you arrive!

Your training starts online where you will access all your RAID training manuals and quizzes. Contact us to get started with your e-learning!

Step 2 - Theory & Workshops

On arrival, you’ll meet your instructor who will review your pre-completed e-learning with you. They will also conduct a few workshops on equipment, physics, physiology, management, and safe diving practices to help reinforce your e-learning. You’ll then plan and prepare for your dives and/or some confined pool training time. 


Step 3 - Optional Pool Training

At Hydronauts, we hold a very high standard for training our divers.  Our training courses require divers to complete a few additional skills not required by other agencies so we may spend a bit of time in our Training Pool with you before your open water dives. 

Step 4 - Open Water Dives

Now it’s time to put what you’ve learned in theory, into practice. After your theory and possible pool training, you’ll head out on 4 open water dives over two days. Together with your instructor, you’ll plan and prepare for each dive, completing skills and exercises at varying depths. 

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 diving resort including a hotel, purpose-built training pool, 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


You must wait 18 hours after your last dive before flying in an aircraft.

Need a place to stay? We’re a beachfront diving resort! We offer rooms from single-gender to mixed dorms, queen rooms, family rooms, and bungalows for weekly or monthly rent! You can book a room here

Please stay hydrated – drink lots of water before and after your dives.

Bring sunscreen (preferably reef safe!)


Have another questions? Reach out to us!

Yes! We are a 3-star beachfront resort! We have dorm rooms starting at 300 THB and private accommodation starting at 600 THB. Message us and ask about our diving and accommodation packages! 

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

Explorer 30 or Advanced 35 are the next courses we recommend after your Open Water 20 Course. These courses will get you to improve your buoyancy, advance your understanding of dive planning, and get you diving 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–underwater especially–are informed and contextual rather than rote and textbook. 

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!