Exploring the depths of the Sumidero de Vallada in Valencia is an exhilarating underwater adventure that takes adventurers on a journey through the world’s deepest gypsum cavity. This guided 5-hour tour immerses participants in a captivating landscape of crystal-clear waters and stunning geological formations, offering both excitement and educational insights. Suitable for those aged 10 and above, the experience provides the necessary safety gear, allowing thrill-seekers to enjoy the natural wonder while learning about the unique geological processes at play. But there’s more to this adventure than meets the eye…
Key Points

- This 5-hour tour explores the Sumidero de Vallada, the deepest gypsum cavity in the world, offering crystal-clear waters and unique geological formations.
- Qualified guides lead the aquatic caving experience, providing educational insights and ensuring the safety of participants with specialized equipment.
- The activity is not suitable for children under 10, pregnant women, or non-swimmers, and participants should assess their comfort with confined spaces.
- Comprehensive insurance coverage and a photographic report are included to capture the adventure moments.
- Booking is available online or via phone, with a 24-hour cancellation policy for a full refund.
Activity Overview

For the activity overview, the name of the tour is "Valencia: Aquatic Caving in Sumidero de Vallada".
It’s priced from €50.00 per person and lasts 5 hours. The tour is available at various starting times, with English and Spanish guides.
Travelers can cancel for a full refund up to 24 hours in advance.
The activity takes place at Paraje Las Ermitas Vallada, Valencia, and highlights include exploring the Sumidor Tunnel, swimming in natural caves, and learning about the formation of the geological features.
The Sumidor Tunnel is recognized as the deepest gypsum cavity in the world, part of the Vallada National Heritage.
You can also read our reviews of more tours and experiences in Valencia.
Exploring Sumidor Tunnel

The highlight of the aquatic caving adventure is exploring the awe-inspiring Sumidor Tunnel. This subterranean marvel is recognized as the deepest gypsum cavity in the world, with a provisional drop of 205 meters and a length of approximately 1300 meters. As adventurers swim through its crystal-clear waters, they marvel at the geological formations that have been sculpted over millennia. The experience is both thrilling and educational, as the guide shares insights into the tunnel’s formation and the unique features that make it a part of Vallada’s national heritage.
| Geological Facts | |
|---|---|
| Depth | 205 meters |
| Length | 1300 meters |
| Designation | Deepest gypsum cavity in the world |
| Status | Part of Vallada National Heritage |
Geological Significance

The Sumidero de Vallada is a geological marvel that has captivated explorers and scientists alike. This deep aquatic cave is recognized as the deepest gypsum cavity in the world, with a provisional drop of 205 meters and a length of around 1300 meters.
Its unique formation and geological features make it a remarkable site of natural heritage. The cave’s plaster materials contribute to its notable instability, requiring specialized equipment and expertise for safe exploration.
Delving into this subterranean wonderland offers visitors a chance to witness the remarkable power of nature and the intricate processes that shape our planet’s hidden landscapes.
Safety Considerations

Exploring the Sumidero de Vallada requires suitable equipment and expertise. The geological features, including the notable instability due to plaster materials, necessitate proper safety measures.
Visitors are provided with:
- Qualified guides who ensure the group’s well-being throughout the excursion.
- Specialized activity materials such as helmets, harnesses, and other necessary gear.
- Comprehensive insurance coverage, including company liability and accident insurance, for peace of mind.
- A photographic report to capture the unforgettable moments of the caving adventure.
These safety considerations are essential in navigating the Sumidero de Vallada’s depth and length, allowing adventurers to explore the wonders of this remarkable natural formation safely and responsibly.
Participant Requirements
Not every adventurer may be suited for the challenges of aquatic caving in Sumidero de Vallada.
Children under 10, pregnant women, people with mobility issues, those with claustrophobia, and non-swimmers are advised against participating.
Proper equipment is a must, including swimwear, change of clothes, towel, and water shoes.
Participants should provide their full name, ID, contact details, height, and weight to ensure the correct sizing of gear.
While an unforgettable experience, aquatic caving requires specific physical abilities and a willingness to navigate confined, watery spaces.
Prospective guests should carefully consider if this activity aligns with their skills and comfort level.
Provided Equipment
Alongside the qualified guides, Grieta Aventura provides participants with all the specific activity materials needed for their aquatic caving excursion in Sumidero de Vallada.
These essential items include:
- Helmets to protect your head in the confined cave environment.
- Harnesses to ensure your safety during the descent and ascent.
- Waterproof lights to illuminate the dark, underground caverns.
- Wetsuits to keep you warm and comfortable while swimming in the natural lakes.
With this comprehensive gear provided, adventurers can focus on seeing the breathtaking journey through the deepest gypsum cavity in the world, the Sumidor Tunnel.
Customer Feedback

Customers have overwhelmingly praised the aquatic caving experience in Sumidero de Vallada, awarding it a 5/5 rating based on 4 reviews. One reviewer, Franziska from Germany, described the activity as "Incredible experience with Jose and Omar. Challenging yet fun, guaranteed adrenaline rush. Unforgettable memories!"
| Reviewer | Location | Rating | Date |
|---|---|---|---|
| Franziska | Germany | 5/5 | October 17, 2023 |
The combination of qualified guides, specialized equipment, and the stunning natural beauty of the Sumidor Tunnel has captivated participants, making this adventure a must-do for avid explorers and thrill-seekers alike.
Booking Information
To book this aquatic caving adventure, you will need to provide their full name, ID, contact details, height, and weight. This information is necessary for the company to ensure proper fitting of the required equipment, such as helmets and harnesses.
The booking process is simple and can be completed either online or over the phone. Once the details are provided, the company will confirm the availability and finalize the booking.
Participants should note the cancellation policy, which allows for free cancellation up to 24 hours in advance for a full refund.
The key steps for booking are:
- Provide full name, ID, and contact details.
- Share height and weight for equipment sizing.
- Confirm availability and complete the booking.
- Review the cancellation policy.
Things To Know

How Challenging Is the Caving Experience for Beginners?
The caving experience can be challenging for beginners as it requires swimming through narrow underwater passages and navigating unstable terrain. However, the activity provides qualified guides and proper equipment to ensure safety and support for those with limited caving experience.
Can I Bring My Own Equipment Instead of the Provided Gear?
You can’t bring your own equipment for this activity. The provided gear is required for safety and to ensure proper fit. Using the company’s specialized equipment is part of the experience and ensures participants’ well-being in the challenging cave environment.
Are There Any Age Restrictions for Participants?
Yes, there are age restrictions for participants. The activity is not suitable for children under 10 years old. The company requires a certain level of physical ability and swimming skills to ensure everyone’s safety during the aquatic caving experience.
What Is the Policy for Groups or Private Tours?
The activity provider offers private tours and group discounts, but group size is limited. Participants should inquire about availability and rates when booking. Advance reservations are required to secure a spot.
Can I Extend the Duration of the Caving Activity?
Yes, the activity duration can be extended. Participants can discuss this option with the booking staff and arrange a longer excursion for an additional fee. The extended time allows for more exploration within the cave system.
Sum Up
Valencia: Aquatic Caving in Sumidero de Vallada offers an unforgettable adventure in the world’s deepest gypsum cavity. Explore crystal-clear waters and stunning geological formations with a guided tour, learning about the unique processes that shaped this natural wonder. Suitable for adventurers over 10, the experience provides all necessary gear for a safe and thrilling exploration of this captivating underground landscape.
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