Take Your Deep Diving Specialty Course on Koh Tao
The SSI Deep Diving Specialty Course prepares you for the unique challenges of exploring dive sites beyond 30 meters. This certification gives you access to the 40-meter dive certification limit, opening up wrecks, walls, and other deeper environments that most recreational divers never get to see.
Taught by highly experienced instructors, this course combines classroom theory, real-world experience, and detailed briefings to ensure you leave with lasting confidence and skill. It’s one of the most popular deep diving courses on Koh Tao, and a must for divers looking to go beyond the basics.
Why Take This Course?
Unlock the 40m limit, learn how to dive deep safely, and experience new sites with the confidence and training to match.
You’ll gain experience in dive planning, gas management, buoyancy at depth, and handling limited visibility.
The course also introduces you to important risk factors like nitrogen narcosis and how to recognize and respond to it.
Learning how to dive deep safely is a valuable step in your scuba journey, whether you dive recreationally or have ambitions to go pro.
7,250 THB
How You’ll Earn Your 40 Meter Dive Certification
The SSI Deep Diving Specialty Course takes place over two days and includes three open water dives, each one taking you progressively deeper. With theory you can complete in advance and flexible in-water scheduling, this course is ideal for divers who want to stay on track with their holiday plans while earning their 40-meter dive certification.
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Part 1: Knowledge Development
Before diving in, you’ll review theory through the SSI app, covering topics like nitrogen narcosis, air consumption at depth, redundant equipment, and deep diving safety. Your instructor will guide you through real-world applications and help you build a solid understanding of what changes the deeper you go.
There’s no final exam — just practical, focused discussion that prepares you to plan and execute deep dives with confidence. You’ll also review local dive site conditions and gear considerations specific to deep diving on Koh Tao.
Part 2: Deep Dives 1 & 2
Your first two dives will take you beyond the 18-meter recreational limit, into the 18–30 meter range. These dives focus on getting comfortable with deeper conditions, including limited light, faster air consumption, and adjusted buoyancy.
You’ll practise dive planning, track your no-decompression limits (NDL), and refine your navigation while experiencing the environmental changes that make deep diving so unique.
Part 3: Deep Dive 3
The final dive takes you to the maximum recreational limit of 40 meters. You’ll plan this dive alongside your instructor, simulate emergency decompression procedures, and apply everything you’ve learned so far.
This is the capstone of the course: it gives you your 40-meter dive certification and gives you the confidence to explore new sites while knowing exactly how to dive deeper safely.
Deep Diving Specialty Course Schedule
The SSI Deep Diving Specialty Course runs over two days and includes three dives and a flexible theory review. Here’s an example of what your training might look like while learning how to dive deeper safely.
DAY ONE
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9:00 AM – Meet your instructor, complete paperwork, and review dive theory
Morning – Deep Dive 1 & 2 (typically 18–30 meters), with a surface interval and dive planning review
Lunch break
Afternoon - Back at the dive center for debriefing and further theory review
DAY TWO
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Morning – Final Deep Dive 3, descending to a max depth of 40 meters
Midday – Course finish, with plenty of time to celebrate or book your next dive adventure
Your deep diving course on Koh Tao can be adjusted to match your travel plans. Just contact us to request a custom schedule or to combine this course with other specialties.
SSI Deep Diving Specialty Course Prerequisites
To ensure all students are properly prepared, the SSI Deep Diving Specialty Course has a few important entry requirements. These help us maintain a high standard of safety and ensure you’re ready to dive to 40 meters safely and confidently.
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Minimum Age
You must be at least 15 years old to enroll in the Deep Diving Specialty. This is in line with international standards for training at depths beyond 21 meters
Minimum Certification Level
You need to hold an Open Water Diver certification or an equivalent from another recognised training agency. If you’ve just completed your Open Water, this is a great next step toward exploring more advanced sites.
Medical Statement
All divers must be medically fit for scuba diving. You can download the official medical form here — if you answer “Yes” to any items, a doctor’s clearance will be required.
Recent Diving Experience
If your last dive was more than 6 months ago, you’ll need to complete a short Scuba Review with us before starting. This helps us ensure you’re covered by our dive insurance and ready for the demands of deeper diving.
DEEP SPECIALTY COURSE
Price: 7,250 THB
Duration: 2 days
Minimum age: 15yrs
Prerequisites: Certified Diver
Schedule
Day 1: 2 AM dives & PM theory
Day 2: 1 AM dive midday finish!
What’s Included in Your Deep Diving Specialty Course
Your SSI Deep Diving Specialty Course includes everything you need to train and dive safely down to 40 meters. From digital learning to gear, insurance, and certification, we’ve bundled the essentials to keep your focus on building real experience and mastering how to dive deeper safely.
You’ll train in small groups of no more than four divers per instructor and complete your course from start to finish right here at Crystal Dive, with our custom dive boats, on-site equipment, and experienced pros guiding every step.
Your course package includes:
- Full SSI Deep Diving Specialty Course with certification
- Access to SSI digital learning materials (Diamond Access upgrade available)
- Use of full scuba equipment during training, including free dive computer rental
- Multilingual personal instructor (max. 4 divers per group)
- Daily boat trips with refreshments
- Dive insurance coverage for all course dives (30 days)
- Crystal Dive T-shirt
- Discounted on-site accommodation during the course
- 10% discount on additional diver-level training or equipment purchases
BIG DISCOUNTS ON PRIVATE ROOMS WITH AC & ENSUITE
With all of our courses you can make use of our private AC ensuite rooms with huge discounts.
When you´re learning to dive its important that you get a good night of sleep. During the length of all courses you can check in to our accommodation with big discounts! Have a look at our latest deals and prices here.
Message us to look at upgrades and for more info click here.
Book Your SSI Deep Diving Specialty Course
Ready to explore beyond the limits of your current certification? The SSI Deep Diving Specialty Course at Crystal Dive Koh Tao trains you to plan and conduct dives down to 40 meters while staying within safe gas and no-decompression limits.
฿7,250
In just two days and three dives, you’ll build the skills needed to confidently manage deeper environments, navigate with limited light, and recognize signs of narcosis or gas management issues. This training not only unlocks new sites around the world, but also prepares you for future pro-level programs like Divemaster.
If you’re wondering how to dive deeper safely, this 40-meter dive certification course is your answer. Deep diving courses on Koh Tao are a favorite for divers looking to level up in paradise.
Deep Diving Specialty
In just two days and three dives, you’ll build the skills needed to confidently manage deeper environments, navigate with limited light, and recognize signs of narcosis or gas management issues. This training not only unlocks new sites around the world, but also prepares you for future pro-level programs like Divemaster.
If you’re wondering how to dive deeper safely, this 40-meter dive certification course is your answer. Deep diving courses on Koh Tao are a favorite for divers looking to level up in paradise.
Capture Your Deep Diving Experience
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Want to remember your first 40-meter dive? Our in-house photo and video team, Crystal Images, offers professional underwater media packages to document your Deep Diving Specialty Course. Choose from a cinematic 10-minute highlight video or a set of 10–15 high-resolution underwater photos — perfect for sharing your achievement or reliving the adventure.
These packages are available as add-ons to your deep diving course on Koh Tao and can be booked during checkout by selecting the “Video & Photo” option.
Have questions or want to book as a group? Just ask — we’ll make sure your deep dive is one you’ll never forget.
FAQ – Frequently Asked Questions
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Can I start my Deep Diver Specialty every day?
In general, yes. We start our courses any given day. To secure your desired start date, we recommend booking your Deep Diver Specialty online here. This will guarantee your placement in a small group of maximum 4 students per instructor.
Is it possible to change the schedule for the Deep Diver Specialty?
Our schedules are flexible and we will do everything to adjust it to your travel plans. Please contact us to arrange for a schedule that suits you within the limits of the Deep Diver Specialty performance requirements.
Is there a shorter course option available for the Deep Diver Specialty?
If you did a deep dive on your Advanced Adventurer, then you have already completed the Deep Adventure Dive. You could then finish all remaining dives in 1 day. Due to the depth we recommend though to split the course over at least 1.5 days or to combine it with other courses. Contact us at any time for more information.
What are the rates for accommodation?
For your Deep Diver Specialty Course we offer accommodation in a private AC room (choice of Double or Twin) at a discounted rate for the standard course duration of 2 nights. There are also upgrade options available for the adjacent Koh Tao Regal or Beach Club Resort. More information here or just contact us directly.
What are the minimum requirements to start my Deep Diver Specialty?
The minimum requirements for you to enroll in the Deep Diver Specialty are listed here. If you still have questions about specific requirements or an equivalent certification, please contact us directly.
How many students will be together with me in my Deep Diver Specialty?
We pride ourselves to teach our Deep Diver Specialty personal in groups of max. 4 students per instructor. If you still prefer a smaller group or a private course please contact us directly. On the other hand, if you travel in a bigger group, please let us know and we will arrange for multiple instructors to teach you together.
Will I see different dive sites during my Open Water Dives in the Deep Diver Specialty?
We have 2 custom built dive boats and choose the dive sites based on your course requirements, comfort level and weather conditions. Generally, we change dive sites on a daily basis, so you will dive at the best spots available for your Deep Diver Specialty. More about our boats here.
Can I take a Go Pro on my dives for the Deep Diver Specialty?
Currently, under Thai law, neither students nor instructors are allowed to use cameras during any course, except for specific photo/video courses. Our in-house Video & Photo company Crystal Images can take professional photos or a broadcast quality video of you on two of your dives on the Deep Diver Specialty. Please contact us or check out your options here.
What other courses can I take if I have some more time after my Deep Diver Specialty?
We have put together some recommendations for you under this link for dive activities that you may find interesting after or together with your Deep Diver Specialty. If you are interested in other activities, have a look at our shop and check out our multi-course packages as well.
Other Questions?
Please check out our general FAQ-Page which will answer most of your questions about Koh Tao, diving, weather conditions and everything else. Anything that cannot be answered there, please just contact us and we get right back to you!
