About This Tour
We descend the vertical natural rock and enter the high underground rooms built in concrete. We begin our walk through the fort accompanied by special audio-visual surprise that will take us back in time. Since the facility was built on two levels, there is another abseil for the participants of the Abseil Plus tour. At the end of the tour for the bravest, there is another challenge – turning off the head torches and finding the way out in pitch darkness. At the exit we’re transported back to the starting point. We end the tours socializing and chatting with a glass of wine. If this feels too much for you, check out our offer and book TOUR THE UNDERGROUND WITH NO EXPERIENCE REQUIRED Abseil tour Regardless of which abseil level you want to try, please note again that no previous experience is required for any of them, that each is executed with professional support and guidance of our experienced licenced instructors. WE ARE TAKING YOU TO DEEP TOURS
Final price may vary. Check availability for exact pricing.
Photo Gallery






Final price may vary. Check availability for exact pricing.
TopTours Insights
TUNNEL ABSEILING PLUS tour the underground
This 2.5-hour tour with Adventurer takes you on a boat through underground tunnels, featuring unique rock formations and subterranean passages. It's a good option for travelers seeking a unique, atmospheric adventure without intense physical activity.
Calculating tour characteristics...
What's Included
What's Not Included
Additional Information
Meeting Point
Road signs are at the location.
Cancellation Policy
For a full refund, cancel at least 24 hours before the scheduled departure time.
✓ Free cancellation due to bad weather
Tour Operator
Adventurer
Official supplier for this experience. Bookings are handled directly through Viator with verified partners.
Viator Certified
Trusted local operator
Are you the tour operator?
Get up to 15× more visibility by linking your tours together. Show travelers all your offerings on each tour page. Just one extra booking per month covers the cost. Starting at just $4.99/month.
Guest Ratings
Total review count and overall rating based on Viator and Tripadvisor reviews
Based on 24 verified reviews
Average rating
Frequently Asked Questions
Common questions about TUNNEL ABSEILING PLUS tour the underground
Who operates this experience?
This experience is operated by Adventurer in Istria.
What's included?
This tour includes Private tours, other dates, and times available on request. , Wine tasting, and All of the abseiling equipment is provided, certified according to valid standards and regularly checked. Additional amenities and services are included. All inclusions are provided by the tour operator.
How long is this tour?
The experience lasts approximately 2.5 hours, giving you time to fully enjoy your chosen activity.
Can I cancel this tour?
Yes, you can cancel up to 24 hours before the scheduled departure time for a full refund. If weather conditions are unsafe, the tour may be canceled by the operator. In such cases, you'll be offered a refund or reschedule.
What to expect on this tour?
This tour experience lasts approximately 2.5 hours and includes all necessary equipment and guidance. You'll have access to Private tours, other dates, and times available on request. and more.
Ready to Go?
Book TUNNEL ABSEILING PLUS tour the underground
Secure your spot instantly through Viator and receive flexible cancellation options plus verified customer support.
Trusted partner • Instant confirmation






