FAQ

Cenotes are natural sinkholes or freshwater-filled caves that are commonly found in the Yucatán Peninsula of Mexico, although they exist in other karst regions of the world too. They are incredibly popular among divers, especially cave and cavern divers, due to their crystal-clear water, unique geological formations, and fascinating history.

Cenotes offer stable and optimal conditions for diving, with a temperature of 24°C/76F all year round, and great visibility. They allow long in-water sessions. Furthermore, they vary so much in depth, length, and structure that they allow cave-oriented divers to train and dive on every level, from advanced open water to Rebreather Trimix DPV cave explorations.

The road of a thousand li starts with a first step - Lao Tze. It certainly fits the Cavern Course, as you prepare your entry into the cave: Throughout this course, you will build up the skills to dive safely within the natural daylight and a short distance from the exit. Not only will you learn about proper planning, procedures, and techniques for cavern diving but also about the hazards and how to deal with them. This course is available in both Recreational and technical diving gear.

Once certified as a Cavern diver, you might consider following your training with the Intro to cave, or even to Full cave training.

The TDI Introductory Cave course is the very entry into Deep Dark Diving in full cave equipment and procedures. You are leaving behind the light zone, entering the overhead environment fully. Exciting, rewarding, beautiful.

At the intro to cave level you can penetrate for 1/6th of your sidemount or twinset tanks, pass no restrictions and make no navigational decision. At the full cave level you can penetrate to a maximum of 1/3rd of your total gas, perform complex navigation, circuits and traverses and pass restrictions without equipment removal.

Although the definitions can vary and are often subject to perceptions, generally speaking: A restriction is a passage too narrow or too small for two divers to pass side by side, forcing the dive team to evolve in a single file.

Land-based drills, equipment configuration, navigation protocols and related procedures, and some serious underwater dive time...

The core ethos recognizes that developing reliable muscle memory requires time and repetition—often years of experience in cave diving environments. Many of the skills acquired during training may not be applied immediately, but when the situation demands them, precise execution is essential. The objective is not merely the ability to perform a skill, but to so repeatedly with consistent proficiency and operational reliability under pressure. This requires time to be done correctly - While cave diving requires intensive and methodical preparation, it provides an exceptional sense of achievement and exploration.

YES!!! The cave systems of the Yucatan Peninsula are truly exceptional, offering crystal-clear waters and stable, temperate conditions year-round. These environments accommodate a broad spectrum of divers—from recreational and advanced open-water divers to highly trained Trimix rebreather cave divers—making the region uniquely accessible and rewarding for all levels of experience.

Yes! An Open Water Diver can dive certain cenotes provided the diver has reasonable buoyancy control and propulsion techniques, poses no threat to themselves, other divers (including the guide, us)) and the cave itself. We recommend SDI Advanced Open Water certification.

All different: Mexican Cenote cave diving is all about finesse in the shallows and complex Navigation in temperate waters. European Caves tend to be cold, deep with little to no navigation and Floridian caves - a mix of both. We obviously prefer the cenotes as it will push you to have impeccable buoyancy control and very long dives thanks to the shallow underground rivers of mother nature.

The waters of the cenotes remain a consistent 24°C (75°F) throughout the year. We dive in both wetsuits and drysuits, depending on individual thermal tolerance, dive duration, and personal preferences. As a general guideline, divers should use the equipment they are most comfortable with—provided it does not compromise environmental protection or diving proficiency.

At Deep Dark Diving, we take pride in offering personalized diving experiences tailored to your goals and schedule. Share your plans and time frame with us, and we'll help design a custom itinerary that integrates your dive training with cenote and Cozumel diving opportunities—while also allowing ample time to relax and explore the rich cultural and natural beauty of the region.

Beyond the cavern zone lies the cave environment—a fully overhead, technical setting where no natural light penetrates and direct access to the surface is not possible. While cave diving is classified as technical diving, it does not always involve significant depth or require decompression procedures. However, it remains inherently high-risk and can be fatal without proper training, equipment, and adherence to safety protocols. It's important to remember: there is nothing in any cave worth risking your life for.

You become a certified cave diver upon successful completion of your Cavern, Intro, and Full Cave training courses. This rigorous process not only provides a profound sense of fulfillment but also imparts valuable lessons in self-awareness, discipline, and resilience—ultimately shaping you into a more skilled and confident diver.

Deep Dark Diving provides technical and cave diving courses in English, French, Spanish, and German. We have welcomed students from Korea, China, Japan, Indonesia, and many other parts of Asia, many of whom speak English as a foreign language. To ensure the best learning experience, we recommend completing the TDI e-learning theory modules in your preferred language before arriving on site. This preparation allows you to focus on practical skills underwater, where verbal communication is non-existent.

Cave and technical diving can be costly, though whether they are truly expensive is subject to perspective. Successfully entering—and more importantly, safely exiting—a flooded cave demands reliable equipment, often referred to as a life support system, as well as thorough training from instructors with thousands of hours of experience both diving and teaching in these environments. When viewed in this context, the costs reflect the high level of safety and expertise required, making them reasonable rather than excessive. The same reasoning applies to decompression diving, where the use of specialized mixed gases is essential to protect the diver's health and safety.

Absolutely! The cave environment is delicate, and the cave systems within the cenotes form complex labyrinths. Having a guide with hundreds or even thousands of hours of experience in these areas is essential—not only for diver safety but also for the preservation of the caves. Entrust yourself to our expert guides and fully immerse in the magic of these unique environments!

Renowned diver and explorer Steve Bogaerts collaborated with HP Hartmann to design one of the simplest and most streamlined dive harnesses and systems, drawing from thousands of hours of cave diving experience. After a career spanning over two decades of cave exploration in Mexico, Steve Bogaerts is now retired.

Basic Razor training is designed as a foundation for more advanced diving disciplines such as CCR cave exploration and DPV cave diving. Through this training, you will progressively develop your fundamental skills until they become second nature, eliminating the need to unlearn old habits and relearn new ones at each stage. The greatest advantage is maintaining safety at all times—ensuring that when advanced techniques are required, you rely on a single, well-established muscle memory on the best and most versatile harness on the market.

Many have attempted— including respected instructors— yet few have truly unlocked its full potential. Think of it like holding a driver's license for a Formula 1 car: you may be able to navigate the track, but likely won't fully harness the vehicle's capabilities. Just as luxury sports cars come with specialized training for street driving, treat yourself to the proper instruction to fully experience and maximize your Razor.

Innovator in Sidemount and Cave Exploration, Steve Bogaerts was a leading figure in modern cave diving and a driving force behind the evolution of sidemount diving. Based in Mexico for much of his career, he was instrumental in the exploration of the world's three longest underwater cave systems: Ox Bel Ha, Nohoch Nah Chich, and Dos Ojos.

He is widely recognized for his role in developing the "Mexico-style" sidemount configuration—a minimalist, highly streamlined approach tailored to the demands of complex cave systems. As the creator of the Razor sidemount system, Steve blended practical design with extensive field experience, producing a platform now widely used by cave and technical divers around the world.

Beyond exploration and gear design, Steve was also a respected instructor and mentor. He retired from active diving, but his influence continues to shape the practices of cave divers globally. The term "Bogaerthian" lives on as a nod to his unique approach, precision, and enduring legacy in the world of technical and cave diving.

Technical diving inherently involves elevated risks related to depth, decompression obligations, gas management, and overhead environments. Nevertheless, with rigorous training, strict discipline, and meticulous dive planning, these risks can be effectively managed, ensuring safe diving for those who adhere to established protocols. In fact, accidents among properly trained technical divers are among the rarest in the diving community.

There are very few accidents among properly trained and equipped cave divers who operate within the limits of their experience. While accidents have occurred, they remain exceedingly rare. Training and adherence to established protocols are paramount to ensuring this activity remains safe and enjoyable—much like how one should never take off in a half-fueled plane without a valid pilot's license, recent logged flight hours, clear weather conditions, and confirmed engine maintenance. At Deep Dark Diving, we are committed to instilling proper and safe diving practices in both our students and instructor trainees, emphasizing discipline and responsibility at every stage.

The best configuration depends on your personal preference and the environment you dive in. Ideally, a well-rounded diver should be comfortable in both sidemount and backmount (twinset) setups. To eliminate uncertainty and make an informed choice, we recommend our Backmount vs. Sidemount Workshop. Over two days of hands-on diving with both configurations, you'll gain a practical understanding of their respective advantages and limitations—helping you determine which setup suits you best.

Deep Dark Diving offers Liberty CCR units for rent to our students and in-house divers. If you're traveling light, we can assist with all logistics, including oxygen, sorb, and tanks, to ensure a smooth and well-supported CCR diving experience. Contact us in advance to plan your trip—we're always excited to bring out our favorite toys for some serious underwater cenote experience.

It might seem simple, but using a DPV (Diver Propulsion Vehicle) in a cave environment involves far more than just pressing a button. A TDI Cave DPV course is essential because it teaches critical skills in navigation, team coordination, gas management, emergency procedures, and propulsion control—all within a complex overhead environment where mistakes can escalate quickly.

DPVs significantly increase range, speed, and complexity, meaning:
- You can get far deeper into the cave faster (and further from the exit).
- Gas planning becomes more demanding.
- Emergency scenarios like entanglement, runaway scooters, and equipment failures require specific, practiced responses.
- A proper Cave DPV course teaches you about the unit itself and prepares you to handle these challenges safely, efficiently, and without compromising the cave or your life.

Absolutely! DPVs are often considered every diver's favorite tool—and for good reason. The TDI DPV course is incredibly fun, offering a whole new way to explore and experience cave diving. That said, fun should always go hand-in-hand with responsibility.

Proper training is essential—not only for your own safety but also for the preservation of the cave environment. When handled with skill and care, DPVs open up exciting new possibilities in technical and cave diving.

Owning a DPV isn't always practical—especially if you don't have access to caves or suitable dive sites at home. That's why Deep Dark Diving offers DPV rentals for both students and certified divers visiting us.

If investing in your own unit doesn't make sense for your regular diving environment, renting one during your training or cave diving trip is the perfect solution. All our scooters are maintained according to manufacturer specifications, with regular servicing and battery replacements. Renting with us eliminates the cost and hassle of ownership, maintenance, and travel logistics—while still giving you full access to the fun and capability of cave DPV diving.

Absolutely. At Deep Dark Diving, we maintain a full range of modern, well-maintained rental equipment, and you're welcome to rent what you need during your training or dives. If you prefer to own your gear, we also offer a selection of equipment for sale through our shop.

You're free to bring your personal gear and simply rent or purchase any missing items. This is a great way to avoid the hassle and extra weight of traveling with a full setup.

When booking, just let us know what you'll be needing, and we'll coordinate with your instructor to ensure everything is ready so you can hit the water fully prepared from day one.

To begin your journey into technical diving, you'll need a solid foundation of experience and certifications. Here's what we recommend:

Strong foundational diving skills, typically, 50–100 logged dives with confidence in buoyancy, trim, and situational awareness.
SDI Advanced Open Water certification or an equivalent certification from a recognized agency.
TDI Nitrox certification - Understanding and using enriched air is essential for extended bottom times and safer decompression practices.

Start with a TDI Intro to Tech, TDI Tec Sidemount or TDI Advanced Nitrox course
These entry-level technical courses will introduce you to new equipment configurations, dive planning, and gas management principles—laying the groundwork for deeper and more complex dives.

Divers are drawn to technical diving for a variety of reasons, including:

Access to deeper wrecks, caves, and remote dive sites - Technical training opens the door to environments beyond recreational limits.

Challenge and skill development - It offers the opportunity to refine advanced diving skills, learn new procedures, and push personal boundaries in a controlled, disciplined way. You will find that what you learn in Tec and Cave diving will transcend into your daily life.

Extended bottom times - With proper gas planning and decompression techniques, technical diving allows for longer, more meaningful exploration at depth.

Scientific and exploration diving - Technical diving enables access to unique environments for research and discovery.

Photography and videography in rare environments - Advanced diving skills allow capturing images and footage in locations inaccessible to most divers.

Yes! Decompression diving training is possible in cenotes that have accessible surface exits, commonly known as open cenotes. From a technical perspective, it is similar to diving in blue holes. However, for a well-rounded and robust training experience—especially when taking multiple courses back-to-back—it is ideal to combine cenote dives with sea dives.

Training in the ocean introduces additional challenges such as boat logistics, currents, navigation, and decompression stops in open water, which collectively enhance your proficiency as a diver. As the saying goes: train hard, play hard. Decompression diving in the cenotes is truly a magical experience, and we wholeheartedly recommend that every diver treat themselves to it at least once in their lifetime.

Yes. Several significant prehistoric human remains have been discovered in the cenotes of the Yucatán Peninsula. One of the most well-known is the Eve of Naharon, found in the Sistema Naranjal near Tulum. Her skeleton has been carbon-dated to approximately 13,600 years ago, making it one of the oldest known human remains in the Americas. Discoveries like this offer valuable insights into early human migration and the ancient history of the region.

That said, human remains and archaeological artifacts are absolutely not places for divers. These sites are protected and must be respected as part of Mexico's cultural and scientific heritage. However, the historical and mystical presence of these cenotes can be felt on every dive, making them not only beautiful but deeply meaningful to explore.