Rope down a WWII fortress. This Tunnel Abseiling Plus tour takes you into the underground San Giovanni space, where you learn real technique, not just adrenaline, and you finish with a strong mix of history and guided show-and-tell. What I liked most is the patient coaching from guides like Sara and Marko, and the way the walk ends in audio-visual surprises plus the option to navigate in near total darkness. One catch to plan for: it is 14 to 16°C underground, and non-slip soles are mandatory.

The group stays small, limited to 8 people, so you are not lost in a crowd while you gear up and practice. After the ropes, you get back to the start in a comfortable air-conditioned van, then there is a glass of wine to round it off. If you have claustrophobia or epilepsy, this is not for you, and if you hate cold surprises, bring warmer layers.

Tunnel Abseiling Plus: What You’re Actually Doing Underground

This experience is not just a sightseeing ticket. You are going underground into the San Giovanni WWII fortress, a 550-meter-long space built in two levels, where nature and concrete both played their part. The fortress was unfinished, so the structure feels partly human-made and partly shaped by time. It also had a long period of being forgotten and hidden, and it is only more recently that it has been brought back for visitors.

The core of the tour is abseiling, descending with a rope and controlled technique. You are not thrown into it. The day includes an intro to the gear, an explanation of how the system works, and practice so you can build comfort before you go vertical.

And because it is underground, the atmosphere is its own character. The walk includes special effects and projections, and there is even a moment for the bravest option: turning off your head torch and finding your way out in pitch darkness. That part is intense in a way that feels different from normal caves, because you are doing it while relying on guidance and your own sense of direction.

The WWII San Giovanni Fortress Walk: Two Levels, One Atmosphere

You start with the equipment and technique portion, then move into the underground rooms built in concrete. From there, you shift from practice to the actual route through the facility.

San Giovanni is set up in a way that matches the tour flow. Since it was built on two levels, it naturally creates points where you leave the walking path and go down by rope, then continue deeper into the fortress spaces. That matters because the tour is designed to “ramp” your confidence. You are learning by doing, not by lecture.

Along the route, you also get special effects and projections. This is not just decoration. It helps you understand how the space has changed since it was originally planned, and it gives you a guided sense of place instead of raw corridors. Near the end, there is a final audio-visual surprise that takes you back in time.

For many people, the biggest emotional punch is the switch from guided daylight energy into an underground mood where sound and light behave differently. In the reviews, people highlighted how even the dark parts felt handled well, because the team is focused on safety and instruction while still letting you feel the thrill.

Abseiling Options: Abseil vs Abseil Plus (And What Changes)

Even though this article is about Abseiling Plus, it helps to know the tour is offered in two versions, and the difference is not just “one more rope.” Each version is designed around difficulty and comfort.

Abseil: Beginner-Friendly Descents

The easier Abseil option includes:

• A vertical descent down a natural rock face
• A second descent that can be repeated with a more demanding variation, including a vertical jump
• Instructors provide support and backup during each part

This is set up for beginners. You do not need previous experience. The idea is to learn technique step-by-step, then repeat with small increases in challenge once you know what to do with your body position and rope control.

Abseil Plus: The Third Descent on a Cascading Rock

Abseil Plus is an extended route. After the first two descents, you get an additional descent on a cascading rock inside the fortress. That third section is described as a bit uneven and slippery, so it is more demanding.

The smart part is that you can prepare for it by doing the earlier descents with instructor backup. That builds feel and confidence before you step into the trickier surface.

There is also the option to try a simultaneous abseil in pairs, if that is part of your chosen challenge that day. If you like the idea of teamwork with the same safety support, that can be a fun twist.

Your Choice On the Spot

Whether you choose Abseil or Abseil Plus, the tour is set up so you can decide on site which descent you want to do based on comfort level. That matters if your nerves spike once you are geared up. You are not stuck with a single plan that ignores how your body feels that day.

What the Training Covers Before You Go Vertical

The tour starts with a real technique briefing. You get:

• An introduction to abseiling technique
• Equipment familiarization (so you understand what you are wearing and why)
• An exercise on a horizontal surface
• A descent demonstration before you go down on the rock

This order is practical. Horizontal practice helps you learn without the pressure of height. A demonstration gives you a visual target. Then vertical descent becomes less mysterious and more like a skill you are applying.

Also, the tour includes insurance and uses certified equipment that is regularly checked. That combination is important for peace of mind when your activity is technical and physical.

From the reviews, a strong theme is how calmly and clearly instructors explain things, even for first-timers. People also mention feeling safe thanks to patient guidance rather than rushing or showboating.

How the Underground Experience Keeps You Engaged

A tunnel can be visually boring if it is all gray walls and no story. Here, the tour does a good job of breaking up the time and keeping your brain switched on.

You move through:

• Practice and gear familiarization
• The vertical rock descent(s)
• Concrete underground rooms
• Special effects and projection moments during your walk
• An audio-visual surprise near the end

Then there is the pitch-dark optional challenge. If you do it, you are essentially asked to trust your bearings and guidance without the usual comfort of head-torch visibility. It is the kind of moment that feels spooky at first and then strangely empowering once you realize it is controlled and guided.

If you are the type who gets unsettled by darkness, you can likely still enjoy the rest of the tour. But the warning is clear: those with claustrophobia should not book.

Safety, Comfort, and the Real-World Stuff to Plan

This is adventure tourism, so you should go in with your eyes open. The tour is designed for first-timers, but it is still a rope-based descent activity in an underground environment.

Wear the Right Shoes, or Skip the Whole Thing

Shoes with non-slip soles are mandatory. This is not a suggestion. It is listed as an important requirement, and it is part of why the team can manage uneven and slippery sections.

Bring hiking shoes or sturdy sneakers. The temperature underground is around 14 to 16°C. Plan warmer layers even if you start the day outside in Croatia’s warmer weather.

Who Should Think Twice

This tour is not suitable for:

• Children under 10
• People with claustrophobia
• People with epilepsy

Also, the tour is done at your own risk, and the team can adjust the route based on factors like bad weather, inadequate footwear, or if someone is under the influence of alcohol or drugs. That is a normal safety approach, and it means you should arrive ready and sober.

Cold and Darkness Are Part of the Experience

Underground temperatures are cool, and the facility includes moments with head torches turned off during the optional challenge. If you get uncomfortable in tight, dark spaces, it is better to choose a different kind of tour entirely.

Duration and Group Size: Why 150 Minutes Works

The tour runs about 150 minutes, and it feels like a “full experience” without turning into a half-day ordeal. You get enough time for equipment prep, instruction, multiple descents on the Plus route, and a complete underground story arc with effects and end-of-tour surprises.

The group size is limited to 8 participants. That matters. With a small group, instructors can monitor form and comfort more easily, and you are less likely to be waiting around while everyone else does the hard part.

The language is English, and the tour includes guide support throughout. If you want an activity where safety is explained clearly, this is a strong setup.

Price and Value: Is $88 Worth It?

At $88 per person for a 150-minute guided activity, the value comes from what is actually included, not just the thrill.

Included items include:

• Abseiling equipment (certified and regularly checked)
• A guided tour and entrance to the underground fort San Giovanni
• Insurance
• Professional certified guides
• Audio-visual special effects and projection
• Wine tasting at the end
• A small-group format (up to 8)

When you compare this to solo adventure time, gear rental, and paying for instruction, this price is reasonable. You are basically paying for a complete package: training, technical activity support, and a guided underground experience with entertainment built in.

If you only want a quick walk-and-look, then it is probably more than you need. But if you want a structured first abseiling experience in a dramatic setting, it is a fair deal.

The Wine Finish and Transport Back

After the last surprise and exit, you get transported back to the starting point by a comfortable air-conditioned van. Then the tour ends with socializing and a glass of wine.

That is a small thing, but it is a nice one. Rope activities can put you in a focused, adrenaline mode. The wine moment helps you shift back into normal conversation and compare notes with your group, especially since the descent routes and comfort choices can differ from person to person.

Should You Book Tunnel Abseiling Plus?

Book it if you want:

• A first-time-friendly abseiling experience with step-by-step instruction
• A small-group adventure (up to 8 people)
• Underground WWII atmosphere plus guided effects
• A tour that mixes challenge with a clear safety focus

Skip it if:

• You have claustrophobia or epilepsy
• You cannot follow safety instructions, especially the non-slip shoe rule
• You are not willing to dress for 14 to 16°C underground temps
• You know you will not cope with the pitch-dark optional challenge

If you fit the first group, you are going to get a rare combo: technical fun, real coaching, and a memorable underground setting that feels more than just a tunnel tour.

FAQ

What is included in the Tunnel Abseiling Plus tour?

The tour includes certified abseiling equipment, a guided visit with entrance to the underground fort San Giovanni, audio-visual special effects and projections, insurance, professional certified guides, and wine tasting.

How long is the tour?

The duration is 150 minutes.

Is prior abseiling experience required?

No previous experience is required. You start with a technique and equipment introduction, practice on a horizontal surface, and a descent demonstration. Instructors provide backup during the descents.

What is the difference between Abseil and Abseil Plus?

Abseil includes underground fortress entry plus vertical descents with beginner-friendly variations. Abseil Plus adds another descent on a cascading, uneven, and slippery rock inside the fortress, and it can be more demanding.

What footwear do I need?

Shoes with non-slip soles are mandatory. Bring hiking shoes or sports shoes, and make sure they provide good grip.

How cold is it underground?

The underground facilities are about 14°C to 16°C. Bring warmer clothes.

What group size should I expect?

The tour is a small group, limited to 8 participants.

What language is the tour guide?

The live tour guide is available in English.

Who should not book this tour?

It is not recommended for people with epilepsy or claustrophobia. Children under 10 are also not suitable.

Can I cancel for a refund?

Free cancellation is available up to 24 hours in advance for a full refund.