TUNNEL ABSEILING PLUS tour the underground

A 550-meter World War II fortress is an unusual place to learn abseiling. At San Giovanni, you begin on natural rock, lower yourself by rope into tall concrete chambers, and continue through a forgotten underground complex with special effects and a final stretch in total darkness. The setting is the real draw.

I like the careful progression from a horizontal practice session to easier descents and then, for the Abseil Plus option, a slippery cascading-rock section. I also like the small group limit of eight, which gives the guides room to help nervous beginners. The main consideration is comfort: the fortress stays around 14 to 16°C, the rock can be wet and uneven, and claustrophobia is a firm reason to choose another activity.

• Three abseils on the Abseil Plus tour: Start with easier descents before trying the more demanding cascading rock inside the fortress.
• A genuine underground fortress: San Giovanni combines unfinished military construction with natural rock formations.
• Beginner-friendly instruction: You receive a technique briefing, equipment practice, a demonstration, and guidance from certified instructors.
• A dark final challenge: You can turn off your head torch and try to find the exit in complete darkness.
• A relaxed finish: The tour ends with an audio-visual presentation and a glass of wine.
• Practical small-group format: The experience lasts 150 minutes, runs in English, and costs $88 per person.

Why San Giovanni Fortress Makes This Abseil Different

Many abseiling outings are built around a scenic cliff or a single rock face. This one adds an underground fortress, military history, architecture, natural rock, sound, light, and a little theatrical suspense. You are not simply lowering yourself and leaving. The rope work becomes one part of a longer visit.

San Giovanni was built as a World War II fortress but was never completed. That unfinished state gives the site its character. Human-made concrete chambers meet rough natural rock, and the two-level structure creates room for different sections of the tour. The building was forgotten for years before being repaired and prepared for visitors, so the experience has a rawer feel than a polished museum.

I like this mix because the history never feels separated from the activity. You learn about the site while moving through it, then see the architecture from angles that a standard walking tour could not provide. The abseiling also gives you a reason to enter parts of the fortress that would otherwise feel inaccessible.

The location is listed in Zagreb County, Croatia. The supplied information also describes it as an option for people visiting or passing through the Rijeka area, so check the exact meeting point and transport details carefully before booking.

Your First 30 Minutes: Training Before the Rope

The tour begins with an introduction to abseiling technique and a chance to become familiar with the equipment. You do not need previous experience, and the instructors explain the basic movements before asking you to leave the ground.

You then practice on a horizontal surface. This is a useful step, especially if the sight of a rope and harness makes your stomach tighten. It lets you learn how the system feels, how to position your body, and how to control your movement before standing at the edge of a vertical rock.

Next comes a descent demonstration. Watch closely here. The demonstration shows the pace and body position you will use, and it gives you a clear idea of how much control you have once the rope is loaded. The instructors provide backup and guidance throughout the descents, so you are not expected to manage the full process alone.

The equipment is supplied by the operator, certified according to current standards, and regularly checked. That does not remove every risk, but it is an important practical point. You should still listen carefully, follow instructions, and treat the activity as an adventure rather than a casual photo stop.

Choosing Between Abseil and Abseil Plus

The standard Abseil tour includes the fortress visit and one or two descents with different difficulty levels. The easier version involves walking down a vertical rock face. After that, you may repeat the descent with a vertical jump, which adds a stronger rush without requiring advanced skills.

Both versions are designed for beginners with instructor support. More important, you can decide on the spot which descent feels right for you. That flexibility matters because confidence can change quickly once you see the rock in front of you.

The Abseil Plus tour adds another descent inside the fortress. This takes place on cascading rock that is more uneven and slippery. It is the tougher section, and you should not treat it as a small extra. The first descents are used to help you develop a feel for the technique and gain confidence before trying it.

Abseil Plus also allows a simultaneous descent in pairs. That can add a fun social element, but the key attraction is the gradual increase in challenge. You are not pushed straight into the hardest section.

At $88 per person, the Plus version offers solid value if you want a full activity rather than a brief introduction. The price includes equipment, instruction, entry, the guided fortress walk, special effects, insurance, and wine tasting. If you mainly want to see the fortress and try abseiling once, the shorter Abseil option may be a better fit if available for your date.

Entering the Concrete Chambers

Once you are equipped, the route takes you down the vertical natural rock and into the fortress. The change in atmosphere is part of the reward. Outside, the focus is on rope technique and body position. Inside, the high concrete rooms make the military purpose of the structure easier to picture.

The fortress was built on two levels, so the route is not just a straight tunnel walk. Participants on Abseil Plus have another descent to complete inside the facility. The cascading rock is described as slippery and uneven, which means sturdy footwear is not optional.

The temperature remains around 14 to 16°C. That is cool enough to feel chilly after standing around, even if the weather outside is warm. Bring a warmer layer that allows free movement. Bulky clothing could get in the way of a harness, so practical outdoor clothing is the sensible choice.

You also need shoes with non-slip soles. Hiking shoes or sturdy sports shoes are suitable. Trainers with smooth soles are a poor choice here, and the agency can adjust or refuse participation if your footwear is inadequate.

Special Effects, Sound, and the Pitch-Black Challenge

The walk through the fortress includes special effects and an audio-visual presentation. These elements turn the visit into more than a technical climbing lesson, though you should not expect a conventional museum tour filled with displays.

At the end, a special audio-visual surprise looks back in time. It gives the unfinished structure a stronger sense of place and helps connect the concrete rooms to the era in which the fortress was built.

For the bravest participants, the guide offers another challenge: switch off your head torches and find the way out in complete darkness. This is a short optional test, but it can be more intense than the rope work for anyone uneasy in enclosed spaces.

That detail also explains why the activity is not suitable for people with claustrophobia. The darkness is not simply a lack of lighting. It removes your usual visual reference points inside an underground facility. Anyone prone to panic in tight or dark spaces should skip this tour, even if the abseiling itself sounds appealing.

The experience is also not recommended for people with epilepsy, and it is not suitable for children under 10.

Guides, Safety, and the Beginner Experience

The supplied experience details identify professional certified guides, and the strongest practical point is the amount of instruction built into the schedule. You receive an equipment introduction, a horizontal practice session, a demonstration, and active support during the descents.

Guide names associated with recent departures include Sara and Marko. Their role is not limited to managing ropes. They explain the technique, provide historical context, and help participants move at a comfortable pace. That combination is especially useful for first-timers who want both an adventure and a proper introduction to the site.

The experience is conducted in English. The group limit of eight should help keep instruction personal, though the exact amount of individual attention can still depend on how many people choose the harder option.

You remain responsible for deciding what you are comfortable doing. The operator says each participant may select a descent based on personal comfort, so there is no need to prove anything. A good day here means leaving with a sense of achievement, not forcing yourself onto the most difficult rock.

The tour and entry to the underground facilities are taken at your own risk. Do not drink alcohol before the activity, and do not arrive under the influence of drugs. Weather can also lead the agency to change or adjust the tour.

What the $88 Price Really Covers

The $88 price is not just an admission ticket. It includes the guided entry to San Giovanni fortress, all abseiling equipment, professional instruction, insurance, special effects, the audio-visual presentation, and wine tasting at the end.

That makes the price reasonable for a 150-minute small-group activity, particularly if you choose Abseil Plus and use all the included descents. Equipment rental and instruction are often the costly parts of an adventure activity, and both are included here.

The value depends on what you want from your day. If your priority is a detailed military history tour, this may feel activity-led rather than museum-led. If you want a memorable way to see an unusual fortress, the price is easier to justify.

The final glass of wine is a pleasant social finish, but it is not the reason to book. The real value comes from the combination of a rarely seen underground site and a properly supervised first experience with abseiling.

Clothes, Shoes, and Other Practical Advice

Bring a warmer layer, even in summer. The underground temperature is listed at 14 to 16°C, and you may notice the cold more while listening to instructions or waiting for another participant.

Wear hiking shoes or sturdy sports shoes with non-slip soles. This is the most important packing rule. The route includes natural rock, vertical surfaces, and a slippery cascading section on Abseil Plus.

Plan for the full 150 minutes. The schedule includes instruction, practice, equipment fitting, several route sections, the special effects, the darkness challenge, and the wine finish. It is not a quick rope descent attached to a short tunnel walk.

Free cancellation is available up to 24 hours before the activity, and you can reserve now and pay later. Private tours and other dates or times can be requested through the operator. The small group size is limited to eight people, which makes this a good option for couples, families with older children, or small groups of friends who want a private arrangement.

Who Should Book the Abseil Plus Tour

I would suggest Abseil Plus to an active adult or older child who wants a physical challenge but has no previous climbing experience. The gradual training makes it approachable, while the third descent gives the outing a stronger finish.

It also suits people who like unusual historical sites but do not want to spend the whole day reading plaques. You move, learn, listen, and test yourself in a place that is difficult to understand from photographs alone.

The tour may not suit someone who wants a calm underground walk. Even the standard option includes rope work, vertical rock, and equipment. The Plus version adds slippery rock and a possible paired descent, so it is best for anyone comfortable with a clear physical challenge.

Skip it if you have claustrophobia, epilepsy, or difficulty with cold, uneven surfaces, or enclosed darkness. Children under 10 are not accepted.

Should You Book It?

Book this tour if you want a memorable half-day activity with a strong sense of place. The best parts are the unfinished fortress, the gentle introduction to abseiling, and the way the guides build confidence before the harder section. The final wine and audio-visual presentation give the experience a friendly finish rather than ending abruptly at the exit.

Choose the standard Abseil option if you are curious but cautious. Choose Abseil Plus if you want the full challenge and like the idea of testing yourself on cascading rock inside a two-level fortress.

At $88, the tour earns its price through the equipment, instruction, small group, fortress access, and included activities. Bring proper shoes, wear a warm layer, and be honest about your comfort with darkness. If those conditions suit you, San Giovanni offers a rare mix of history and adrenaline without requiring previous experience.

FAQ

Where does the tour take place?

The activity takes place at the underground World War II fortress San Giovanni in Zagreb County, Croatia.

How long does the experience last?

The tour lasts 150 minutes.

How much does the tour cost?

The listed price is $88 per person.

Is previous abseiling experience required?

No. The tour is designed for beginners, with instruction, practice, a demonstration, and support from professional certified guides.

What is included in the price?

The price includes certified abseiling equipment, a guided tour and fortress entrance, professional certified guides, insurance, audio-visual special effects, a projection, and wine tasting.

What should I wear?

Bring warmer clothes because the underground temperature is about 14 to 16°C. You must wear hiking shoes or sturdy sports shoes with non-slip soles.

What is the difference between Abseil and Abseil Plus?

The standard Abseil tour includes the fortress visit and one or two descents with different difficulty levels. Abseil Plus adds another descent on cascading rock inside the fortress and may include a simultaneous paired descent.

Is the tour available in English?

Yes. The tour has a live English-speaking guide.

How many people are in each group?

The group is limited to eight participants.

Who should not take this tour?

The activity is not suitable for children under 10, people with claustrophobia, or people with epilepsy. Participants must also have suitable footwear and must not be under the influence of alcohol or drugs.