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Documentary series following the dedicated rescue teams based in the stunning but extreme landscape of Eryri, north Wales. Beneath Eryri’s spectacular scenery, there’s another hidden world that lies below the surface. The network of abandoned caves and mines that are a legacy of its industrial past are now drawing in a new kind of visitor, in search of adventure. But if something goes wrong, you can find yourself a long way from help, with no phone signal - as one mum discovered after she brought her 15-year-old son and his friend to explore a route through an old mine. When her son is stranded after falling in a freezing cold underground lake, she has to leave both boys together underground while she heads to the surface for help. Can the specialists from Cave Rescue reach the boys before they panic and try to find their own way out?

Casualties don’t have to be deep underground or at the top of a mountain to be out of reach. When Mountain Rescue are called out to help a walker with a bad back, it looks like a straightforward job. He’s lying less than half a kilometre away across fairly flat ground. But they soon discover they’ll have to cross the ‘Bog of Doom’ to reach him! Thankfully the coastguard helicopter is on hand to pitch in.

When a woman slips on a family outing to a popular beauty spot, it will take all the skills of the rescue teams to get her out. She’s fallen 20 feet down onto boulders next to a river, at a place known as Ffos Anoddun. An ambulance crew has managed to reach her - but with a suspected spinal injury, they’ll need the specialist skills of Mountain Rescue to get her out safely.