Descend into a rediscovered WWII fortress beneath Rovinj with professional belays, audio-visual history, and a final pitch-black navigation challenge. The Abseil Plus adds steeper, cascading drops and paired descents for more experienced adventurers.
More ways to explore the area's outdoor wonders
You step off the cliff into cool, echoing air: rope humming, boots finding purchase on wet limestone, and concrete vaults swallowing the sound. The first descent drops you into a half-carved world—raw rock meeting unfinished concrete chambers—then the guide's projector ignites panels of history across the walls. In the deepest rooms you’ll pause, tip your headlamp out and let absolute dark close in; the silence feels like the fort itself testing you.
Difficulty
moderate
Duration
2–3 hours
Fitness Level
Suitable for people in average physical condition who can handle short, exposed rope descents and uneven footing.
Wildlife
History
The site is an unfinished WWII coastal fortress carved into Istrian limestone and recently stabilized and opened for visitors with interpretive AV panels.
Conservation
Small group sizes and certified equipment reduce impact; visitors are asked to avoid touching fragile rock formations and to follow Leave No Trace principles.
Reserve your spot on the TUNNEL ABSEILING PLUS tour the underground today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Wear non-slip shoes
Shoes with good grip are mandatory—no smooth soles; slippery rock is part of the route.
Expect damp and cool conditions
Bring a light insulating layer; underground temperatures stay lower than the surface.
Mind the darkness challenge
If you have claustrophobia or epilepsy, avoid the headlamp-off section—opt for the standard abseil instead.
Weight and age checks
Be honest about your weight and follow booking requirements; guides will assess readiness before descents.
Non-slip hiking shoes
Mandatory for safe footing on wet, uneven limestone and cascading sections.
Headlamp (personal)
Guides supply head torches, but a personal lamp gives redundancy—useful if you plan photos or extra light.
Light insulating jacket
Keeps you warm in the cool, damp underground and during surface waits.
spring
Grippy gloves
Thin climbing gloves can improve rope handling and protect hands on rocky surfaces.