TUNNEL ABSEILING PLUS tour the underground

Rope, rock, and a WWII tunnel system. This is Tunnel Abseiling Plus, an active tour in Croatia that takes you into the underground fortress of San Giovanni, a 550-meter space where unfinished architecture meets nature. You also get a chance to descend rock faces by rope, not as a spectator activity, but as hands-on, guided fun.

Two things I really like about this experience are the small group size (max 8) and the way the guides pace the difficulty. Abseil Plus adds extra descents, including a tougher cascading rock section, but you are not thrown in cold. The tour also includes certified equipment, insurance, and guided access, plus audio-video effects and projections underground.

One consideration: you must come prepared. The underground temperature is around 14°C, shoes with non-slip soles are mandatory, and this is not recommended if you have claustrophobia or epilepsy. Also, your meeting point is listed in Rijeka, even though the tour is described for Rovinj, so double-check that before you set off.

Key things to know before you book

• San Giovanni underground fort (550 meters): a WWII site that mixes stonework and natural shapes.
• Abseil Plus means more than two descents: you also attempt a cascading rock drop inside the fortress.
• Practice with instructor backup: the first descents are used to build technique and confidence.
• Optional simultaneous abseil in pairs: a chance to try abseiling with another person.
• Certified gear, insurance, and pro guides: all the safety basics are included.
• Warm, practical clothing matters: it’s about 14°C underground, and non-slip shoes are required.

Tunnel Abseiling Plus in Rovinj: a WWII fortress you can actually feel

Croatia has plenty of caves and viewpoints, but this tour is different because you’re going under ground to experience a WWII-era space that still feels partly unfinished. The San Giovanni fortress is 550 meters long, and it is described as a unique mix of human-made structure and natural influence. That matters because the underground doesn’t feel like a polished “attraction tunnel.” It feels like a real site that got discovered, then reopened for visitors.

Another reason I think this works well is the story layering. You’re not only abseiling on rock and rope, you’re also seeing how the fortress was hidden for years and then put in order for public access. Underground shows can be cheesy, but the included audio-video projections and effects are there to help the space make sense as you move through it.

If you like travel that is part physical activity and part place-based history, this gives you both. You earn the viewpoint, in this case the feeling of being inside a hidden military structure, by actually doing something.

Before you descend: gear, warm clothes, and the safety vibe

The included gear is certified and regularly checked, and you’re covered by insurance. That’s the baseline you want for an activity like abseiling, and it’s not something you should “wing.” The fact that all abseiling equipment is provided means you can travel lighter and focus on what matters: being comfortable and secure in what you wear.

Here’s the practical stuff I’d plan around:

• Underground facilities are about 14°C, so bring warmer clothes.
• Adequate footwear is required, and non-slip soles are mandatory.
• If you show up without the right shoes, you may be turned away or the tour adjusted.

Before you start descending, you should expect instructions on how to handle the rope and how to move safely along the rock. Abseil Plus is more demanding than the standard Abseil version, but the tour is designed to ramp you up step by step. That means your “first attempts” are part of the learning curve, not a test of bravery.

Also, this is a small group activity, up to 8 people. That typically translates into more direct attention from your guide during the gear check and technique coaching. When you’re learning something technical like rope descent, that extra attention is not just a comfort. It’s how you get a smoother experience.

Your rope descent routine: what Abseil Plus includes

Abseil Plus builds on the standard Abseil experience. The core idea is simple: you do multiple rope descents into the fortress interior, and each one prepares you for the next.

From what’s offered, Abseil Plus includes:

• The first two descents (your foundational practice)
• A further descent on cascading rock inside the fortress
• The possibility to try a simultaneous abseil in pairs

The “two descents first” part is important for your comfort. The cascading rock descent inside the fortress is described as uneven and slippery, so you don’t want to start there without technique and confidence. Abseil Plus is set up so you can build a sense of security gradually.

In real life, you’ll feel the difference between a guided “try it” descent and an advanced “push it” descent. Expect the later part to feel more physical and less predictable under your feet because uneven stone changes your rhythm. The good news is you’re doing it with an instructor’s backup available during early attempts, so the learning isn’t left to luck.

The cascading rock descent: the harder part of Abseil Plus

This is the signature moment for Abseil Plus. After the first two descents, you attempt a descent on the cascading rock inside the fortress. The tour description is pretty clear: it’s a bit uneven and slippery, so it takes more effort and more focus.

If you’re wondering what that means for you, think in terms of:

• Your movements need to be slower and more deliberate.
• Your grip and foot placement matter more than on flatter rock.
• You will likely feel the “surprise” of natural surfaces compared to idealized training walls.

The tour also notes a smart coaching approach: you can prepare for the cascading rock section by executing the first abseils with an instructor’s backup. That means you’re not just learning how to hang on a rope. You’re learning how to match your body position to the rock you’re facing.

And yes, that’s why Abseil Plus is labeled as somewhat more demanding. It’s for people who want a step up from the basic version, not a different activity. If you’re comfortable with the idea of heights but still want guidance, this format is a good middle ground.

Inside San Giovanni: projections, audio-visual effects, and staying oriented

One of the easiest ways to ruin a tunnel tour is to make it feel like a featureless hallway with a lot of walking. This one includes audio-video special effects and projections, which are there to bring the WWII setting to life as you move through the fortress.

You can use those moments in a practical way too. Underground spaces can feel disorienting, so narration and projections can help you get bearings fast, even when the environment is dark and enclosed. The fortress is 550 meters, and the experience is designed so you are not just descending rope and then leaving. You’re getting a guided flow through the underground site.

I also like that the fortress has been newly discovered and equipped for visitors. That usually means the route is more thoughtfully managed than random “wild” underground exploration. You’re still underground, and it’s still not a walk in the park, but you can generally expect a tour designed for visitors rather than a “do it yourself” cave day.

Wine tasting underground: a small but smart finish

After the hard part, you get wine tasting included. It might sound like an extra, but it actually makes sense for the overall pacing. An abseiling experience builds adrenaline, focus, and physical effort. Ending with a calm, social moment gives your body a chance to come down from that.

I’d treat it like part of the culture, not a gimmick. Croatian wine tasting is a classic, and it fits well after a memorable, slightly stressful activity. Just keep in mind that the tour notes that you should not be under the influence of alcohol or drugs for participation. That’s about safety and readiness for the ropes, not about cutting the fun. Enjoy the wine at the right time, after you’re done with the climbing and descent.

Price and value: what $90.36 buys you in the real world

At $90.36 per person, this is not a “cheap activity,” but it also is not only a ticket to a cave. Your price covers a lot of the costs that usually add up with adventure tours:

• Certified abseiling equipment
• Entrance in underground fort San Giovanni
• Professional certified guides
• Insurance
• Audio-video projections and effects
• Wine tasting

Most importantly, it includes the safety infrastructure. If you have ever tried to piece together gear rentals, guide time, and access permits on your own, you know that’s where costs hide. Here, it’s bundled, and you’re paying for the guide-led structure and the fact that equipment is checked.

If you are choosing between the standard Abseil and Abseil Plus, think of Abseil Plus as paying for extra technical opportunity. You’re not just doing one more ride. You’re adding a tougher descent on uneven cascading rock, plus a chance at simultaneous pair abseiling. That extra “difficulty and coaching load” is part of what you’re paying for.

Who should take this, and who should skip it

This is offered in English, and the tour says most travelers can participate. That’s a broad statement, but the safety notes are more specific, so I treat those as the real filter.

Skip or reconsider if you have:

• Epileptic seizures
• Claustrophobia

That’s not minor. Underground environments can trigger anxiety, and rope descent is a high-focus activity. The tour also reserves the right to adjust or not proceed if footwear is inadequate or if someone is under the influence of alcohol or drugs. So even if you feel fine, you should still follow the rules and bring the right gear.

Who this suits best:

• You want a guided adventure in Croatia that goes beyond a viewpoint.
• You are okay with heights as long as instruction is involved.
• You like small-group pacing and don’t want to feel rushed.
• You want a WWII setting that gets interpreted, not just walked through.

And if Abseil Plus feels too intense, there is an Abseil option described as no experience required. That’s the safer “first step” if you are unsure about rope confidence.

Timing, weather, and the Rijeka meeting point issue

The duration is about 2 hours 30 minutes, and it is typically booked around 5 days in advance. The activity runs daily with opening hours from 9:30 AM to 5:30 PM.

Important logistics note: the location is listed for Rovinj, but the meeting point is in Rijeka (Adventurer adventure tours, Plase ul. 21). Before you go, confirm where your specific departure starts. In practice, this kind of mismatch happens when a tour is associated with a region but operates from a base location.

Weather matters. The operator can adjust or cancel if conditions are bad, and cancellation due to poor weather means you’ll be offered a different date or a full refund. That’s the right approach for rope-based activities, because wet conditions can affect both the rock and the safety of movement.

This tour also has a small group limit of 8 travelers, which is a good sign if you value instruction and attention.

Should you book Tunnel Abseiling Plus?

Yes, if you want one of the more memorable mixes in Croatia: a guided visit to an underground WWII fortress plus real rope descents with certified equipment and a structured learning curve.

I’d book it if:

• You have the right shoes with non-slip soles.
• You can handle cold underground conditions (bring warmer clothes for around 14°C).
• You want to try Abseiling Plus for the extra cascading rock descent and the chance at pair technique.

I’d skip it if:

• You have claustrophobia or epilepsy.
• You cannot follow the footwear and safety rules.
• You’re looking for a light, purely sightseeing tour.

If you are new to abseiling or just nervous about heights, consider starting with the no experience required Abseil version. Then, if you want more challenge later, Abseil Plus will feel like the natural next step.

FAQ

How long is the Tunnel Abseiling Plus tour?

It lasts about 2 hours 30 minutes.

What is the price per person?

The price is $90.36 per person.

Is the tour offered in English?

Yes, it is offered in English.

What is the difference between Abseil and Abseil Plus?

Abseil Plus includes the first two descents plus an additional descent on the cascading rock inside the fortress. It is described as more demanding because the rock is uneven and slippery, and you may practice with instructor backup during the first descents.

What’s included for safety and equipment?

You get all certified abseiling equipment, insurance, and professional certified guides. The tour also includes entrance in underground fort San Giovanni and the listed audio-video special effects and projections.

Is special footwear required?

Yes. Shoes with non-slip soles are mandatory, and you must bring adequate footwear.

How cold is it underground, and what should I wear?

The underground facilities are about 14°C. Bring warmer clothes and wear appropriate footwear for the conditions.

If the tour is canceled, do I get my money back?

You can cancel for a full refund up to 24 hours in advance. If the tour is canceled due to poor weather, you will be offered a different date or a full refund.