Rappelling underground feels seriously different. In the Rovinj area, you head into the San Giovanni underground WWII fortress, where you rappel down rock faces and learn as you go. What I really like is the certified, regularly checked gear, so the adventure feels organized rather than sketchy.

My second favorite part is the way Abseil Plus builds your confidence. You do the first descents, get instructor backup so your technique clicks, then you take on an extra internal line on a rock that is uneven and slippery.

One thing to plan for: you are spending time in a 14°C underground space, and Abseil Plus asks more physical balance than the basic version, especially with that cascading rock descent.

Key things to know before you go

• WWII San Giovanni fortress, 550 meters long, with a visitor-ready route that still feels raw.
• Abseil Plus adds a harder third descent, on a cascading, uneven, slippery rock.
• Instructor backup on the early descents helps you build technique instead of guessing.
• Small groups (max 8) mean less waiting and more time actually doing the activity.
• Warm clothes and non-slip shoes are mandatory, because conditions underground are cool and traction matters.
• Audio-video effects plus projections add story and atmosphere underground, not just safety instructions.

Rijeka meeting point, Rovinj location, and what 2.5 hours means in practice

This is a short, focused outing, about 2 hours 30 minutes. That matters because you get a complete adventure arc without it swallowing half your day. You also want that pacing when you are in a cool underground environment, because you will move, gear up, rappel, and then warm up again with the included extras.

The tour is listed around Rovinj, but the meeting point is in Rijeka at Adventurer adventure tours, Plase ul. 21, 51000 Rijeka. It is near public transportation, which helps if you are arriving by bus or tram. Before you commit, double-check your day’s exact start details with the provider, since the marketing location and the meeting address live in different cities.

The group size is capped at 8 travelers, so you are not just “watching others do the hard part.” In a small group, instructors can guide positioning, check your setup faster, and keep the energy moving.

Entering the San Giovanni underground fortress: 550 meters of WWII structure made by man and nature

The core setting is the underground World War II fortress San Giovanni, stretched out over 550 meters. The big hook here is that it is not a polished museum tunnel where everything feels staged. It is unfinished in parts, and that gives you a mix of architecture and natural rock that feels real, even today.

You also get more than plain passageways. The included audio-video special effects and projections help connect what you are seeing with why the fortress was built, and how it was meant to function. Even if you are not a hardcore history nerd, this kind of guided interpretation makes the space easier to understand, and it helps the time pass faster while you wait for your turn.

A practical tip: underground spaces are darker and cooler than the street, so you will want to be ready for low-light orientation. Your guide keeps things simple, and the tour is built around moving as a group through the site.

Abseil Plus flow: first descents, then the cascading rock and optional paired rappel

Abseil Plus is the upgrade route. You still start with the basic abseil experience, but then you do more.

Here is the progression you can expect:

1. The first two descents where you learn and practice the core technique with support.
2. A third descent inside the fortress on a cascading rock.

That last part is the real difference. The cascading rock inside the fortress is described as uneven and slippery, so Abseil Plus is more demanding than the standard Abseil option. This is not meant to scare you, it is meant to set expectations. If you are the type who learns best with small steps, Abseil Plus fits well because you practice earlier while an instructor watches and backs you up.

The tour also offers an option to try a simultaneous abseil in pairs. That is a fun twist because it adds teamwork and rhythm. Just remember, your focus should still be technique and control, not trying to match someone else’s pace.

If you feel Abseil Plus might be too much, there is a separate Abseil tour advertised as no experience required. That matters because it gives you a safety-minded way to ease into the same underground setting without the extra internal descent.

Certified gear and safety checks, plus the one rule that makes or breaks comfort

A major part of the value here is that all abseiling equipment is provided and described as certified and regularly checked. You are not lugging your own ropes and harnesses. You show up, get outfitted, and the guides run the process.

You should also know that the underground tour includes insurance and is led by professional certified guides. That combination is what turns a cool idea into something you can actually enjoy. It also means the guides are focused on proper setup, not just storytelling.

Now the non-negotiable rule: you must bring shoes with non-slip soles. The tour info calls this out as mandatory, and it is easy to see why. The cascading rock on Abseil Plus is described as slippery, and in any underground environment, traction affects every step, every stance, and every moment of calm.

What to wear matters just as much as what you do. The underground facilities run at about 14°C, so pack warmer layers even if the weather above is mild. Wear footwear that stays grippy and comfortable for movement before you are actually rappelling.

Wine tasting and the underground show: why the extras are more than a nice add-on

At first, you might think: This is a tunnel, and it is about ropes. Fair. But the tour also includes wine tasting, which adds a local, sit-down payoff after the adrenaline.

That wine stop is not just a snack. It is your reward moment, and it gives you a chance to slow down and chat with your guide. In a small group of up to 8, that conversation time can be genuinely useful, especially if you want context about what you are walking through.

The other extra I appreciate is the use of audio-video effects and projections. Underground sites can feel samey: tunnel, rock wall, repeat. The projections help break that pattern and connect the physical space to the fortress story. One of the reviews highlights a guide, Ela, for enthusiastic guiding and for sharing history tied to both Rijeka and the cave. That matches the idea here: you are not only doing the activity, you are also learning where you are and why it matters.

Who should book Abseil Plus, and who should choose something else

This tour says most travelers can participate, but it also sets boundaries. It is not recommended for people with epileptic seizures and claustrophobia. Underground environments and the pacing of active groups can be a lot if you do not handle tight, enclosed spaces well.

Skill level is handled in a smart way. Abseil Plus includes instructor backup during the early descents, which means you are not thrown straight into the hardest line. You build the feel for the technique first, and then you take on the extra, uneven, slippery section once you have some control.

Who it suits best:

• People who want real adventure paired with guided interpretation.
• Travelers who like structured learning, where an instructor corrects technique during the activity.
• Small-group travelers who hate big crowds and long waits.

Who might prefer the basic Abseil option:

• Anyone worried that Abseil Plus is too physically demanding for the extra cascading-rock descent.
• Travelers who want the same underground environment without the added internal challenge.

Price and value: what $90.36 buys you in a 2.5-hour action tour

The price is listed at $90.36 per person, for roughly 2 hours 30 minutes. On the surface, that is not cheap, but you should judge it by what is included.

You get:

• Abseiling equipment provided (certified and regularly checked)
• Guide tour and entrance in the underground fortress San Giovanni
• Audio-video special effects and projection
• Insurance
• Professional certified guides
• Wine tasting

In other words, you are paying for a staffed, safety-minded activity with equipment and an interpreted site experience. You are not buying just the thrill, you are buying the setup, the risk management, and the guided context that makes the underground feel like a real place with meaning.

Also, the cap of 8 travelers can raise the value. In smaller groups, you get more individual attention without waiting around for everyone to catch up.

Should you book Tunnel Abseiling Plus?

If you want a memorable, hands-on underground experience and you are okay with cool temperatures and the required shoe traction, I think Abseil Plus is worth considering. The big selling point is the combination of certified gear, a guided progression, and that extra internal descent that makes the Plus version feel like a real step up, not just a marketing label.

Book it if:

• You want structured instruction, not guesswork.
• You are excited to try a rope descent and like the idea of doing more than one line.
• You enjoy tours that mix adventure with guided storytelling and an end-of-tour tasting.

Skip it, or switch to the standard Abseil option, if:

• The idea of the slippery, uneven cascading rock sounds like too much.
• You have claustrophobia concerns or any reason you should avoid tight underground spaces.

If you are bringing the right shoes and warm layers, this tour can feel like the best kind of day trip: active, guided, and surprisingly complete for a 2.5-hour window.

FAQ

How long is the Tunnel Abseiling Plus tour?

It lasts about 2 hours 30 minutes.

Is the tour offered in English?

Yes, the tour is offered in English.

What does the price include?

It includes certified abseiling equipment, a guided tour with entrance to underground fortress San Giovanni, audio-video effects and projections, insurance, professional certified guides, and wine tasting.

What should I bring since it is cold underground?

Bring warmer clothes, because the underground facilities are about 14°C, and wear adequate footwear.

What shoes are required for abseiling?

Shoes with non-slip soles are mandatory.

What is different about Abseil Plus compared with Abseil?

Abseil Plus includes the first two descents plus an additional descent on the cascading rock inside the fortress. That extra descent is described as more demanding because the rock is uneven and slippery.

How many people are in a group?

The tour has a maximum of 8 travelers.

What happens if the tour gets canceled due to weather?

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