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Take on a remarkable underground adventure course in the slate caverns of Llechwedd. After instructor-led training, make your own way across 13 zip lines, rope bridges, via ferrata and high obstacles in a dramatic weather-proof setting.
Arrive 30 minutes early to check in, then head to the kit area for a helmet, harness and safety briefing. An instructor leads the walk into the caverns and introduces the equipment in the dedicated training zone.
Once you are comfortable with the system, you enter the main course to tackle a self-paced sequence of bridges, ladders, cables and zip lines. Instructors monitor the course and are ready to help if you need guidance.
The adventure takes place in consistently cool underground conditions, then concludes back above ground where you return your kit. It is a demanding, rewarding route built around the extraordinary former slate mine.
Llechwedd lies on the edge of Blaenau Ffestiniog, surrounded by the slate landscapes of Eryri. Beneath the mountains, the caverns create an atmospheric setting unlike an outdoor high ropes course.
Road, rail and bus connections make the site accessible from across North Wales. The wider area offers walks, heritage railways and mountain scenery for a fuller day in the region.
You must be able to reach 1.8m flat-footed and weigh no more than 130kg. The course is physically demanding and involves heights, balance and sustained movement across obstacles.
Wear warm clothing, sturdy trainers or boots and gloves. Under-15s need one participating adult for every two children, and ages 15 to 17 need one participating adult for every three young people.
This is not simply a high ropes course moved underground: its zip lines and obstacles are threaded through vast historic slate chambers. The training area and monitored course give you space to build confidence before taking on the bigger features.
The steady underground temperature keeps the focus on the adventure rather than the weather. With a long route and multiple ways to test your nerve, it gives groups a genuine shared achievement.
Meet at Llechwedd, Blaenau Ffestiniog, LL41 3NB and check in at reception around 30 minutes before your start time. Follow the team's instructions to the kit and briefing area.
Parking is signposted on site and bus and train connections serve Blaenau Ffestiniog. Allow extra time for the approach and follow local parking guidance.
Allow around three hours for the full underground experience, including equipment fitting, safety training and the main course. Arrive around 30 minutes before your start time so the group can check in and get ready without rushing.
Your pace on the main route may vary as you work through the obstacles and zip lines. The length of the course gives you time to settle into the safety system and enjoy the caverns rather than race through them.
You must be able to reach 1.8m while standing flat footed to take part. This check helps make sure participants can use the course's safety equipment and reach the necessary elements safely.
Try the reach measurement before travelling if you are close to the limit. The team confirms eligibility before the session, and their safety decision is final for the course.
Participants must weigh no more than 130kg. This limit is set for the safe operation of the harness and underground course systems.
The team completes the required safety checks before the activity starts. If you have any uncertainty about participation requirements, confirm them before making the journey.
Wear warm layers because the caverns stay at around 6 to 8 degrees Celsius, even when it is warm outside. Sturdy trainers or boots and gloves are important for moving securely across the obstacles.
Choose clothing that allows you to stretch, climb and balance comfortably. Avoid loose items that could interfere with the harness, clips or zip-line equipment.
No previous high ropes or zip-line experience is required. An instructor leads the initial training in a dedicated area, where you practise using the safety system before entering the main course.
You do need to be comfortable with heights, physical activity and sustained movement across obstacles. Take time in training to ask questions so you feel ready before progressing independently.
After check-in, the team fits your helmet and harness and leads the group into the caverns. An instructor then explains the equipment and demonstrates how to use the safety system in the training zone.
You can practise the clips and movements before taking on the larger elements. This preparation is designed to help you start the main course with a clear understanding of how the route works.
The main route is self-paced once you have completed instructor-led training. You move through the bridges, cables, ladders and underground zip lines independently, choosing a pace that feels manageable.
Instructors monitor the course and remain available if you need help or reassurance. Their presence gives support while still allowing the group to experience the challenge for itself.
The adventure takes place underground, so the course is sheltered from rain, wind and changing outdoor conditions. The caverns offer a consistently cool environment throughout the year.
Conditions around the arrival and departure areas can still be seasonal, so bring a suitable layer for outside. Follow any guidance from the team if site conditions require an adjustment.
Young people who meet the reach, weight and confidence requirements can take part with the required adult participation. Under-15s need one participating adult for every two children, while ages 15 to 17 need one participating adult for every three young people.
Every participant should be ready for a physically demanding course involving heights, balance and climbing. Accompanying adults should stay with their group and follow the instructor's safety guidance throughout.
Meet at Llechwedd, Blaenau Ffestiniog, LL41 3NB, and check in at reception around 30 minutes before your session. The team then directs you to the kit and briefing area.
Parking is signposted on site, and Blaenau Ffestiniog has road, rail and bus connections from across North Wales. Leave extra time for the approach and follow local parking guidance on arrival.
About the centre
Blaenau Ffestiniog
Operated by Zip World Ltd, a partner of adventuro.
