Looking for a stay that’s nothing like your usual city skyline or beachfront view? Forget the open skies and imagine instead spending the night 419 meters beneath the Earth’s surface. That’s exactly what you’ll find at Deep Sleep Hotel, a one of a kind accommodation carved into a forgotten Victorian-era slate mine in Snowdonia National Park, Wales.
But don’t expect luxury chandeliers or marble lobbies Deep Sleep calls itself an “off-grid underground camping adventure,” and the thrill-seekers at Go Below Underground Adventures run the experience. Since its opening in April 2023, it proudly holds the record as the deepest accommodation on the planet.
About Deep Sleep Hotel
The hotel lies hidden inside the abandoned Cwmorthin quarry, a slate mine that was shut down in the mid-20th century. Getting there is half the adventure: guests must embark on a challenging guided journey that combines both hiking and caving.
The experience kicks off with a 45-minute mountain hike before descending deep underground an hour-long trek through the mine itself. The path isn’t simple: expect rickety ladders, ancient stairways, narrow bridges, and steep rocky passages. Along the way, professional guides share fascinating stories about the history of the quarry, immersing visitors not just in the landscape, but also in the legacy of Welsh slate mining.
What’s Inside: Facilities and Experience
While it carries the word “hotel” in its name, Deep Sleep feels much more like a next-level underground campsite. Yet, the comfort and setup are far from roughing it.
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Accommodation: The retreat features four cozy wooden cabins, each with twin beds, plus one romantic grotto with a double bed sculpted directly into the rock. The spaces are heavily insulated to stay warm, even though the mine itself sits at a cool, steady 10°C year-round.
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Food and Drink: Overnight stays include a hearty expedition-style dinner served at a communal picnic table. Think BBQ pulled pork, chili con carne, or vegetarian and vegan-friendly alternatives. Guests can also enjoy hot drinks and a simple breakfast the next morning.
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Utilities: Despite being off-grid, the hotel is surprisingly well-equipped. Lighting runs on batteries, there’s spring-fed running water, composting toilets, and even Wi-Fi deep underground. The only thing missing? Mobile phone signal—making it the perfect place to truly disconnect.
What Makes Deep Sleep Unforgettable
Deep Sleep isn’t just about where you rest—it’s about the epic journey that takes you there and the surreal feeling of lying beneath towering mountains of stone. Here’s what makes it stand out:
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The World’s Deepest Hotel: At 419 meters below ground, no other accommodation on Earth goes this far down.
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The Thrill of the Journey: The trek itself is part of the magic. Crossing broken bridges, clambering down ladders, and walking through dark mine passages makes arriving at Deep Sleep feel like an achievement. Guests are outfitted with helmets, headlamps, and harnesses for safety.
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Total Tranquility: Once inside, you’re completely removed from the outside world. No car horns, no city lights—just silence and pure darkness. Many visitors report having the deepest, most restful sleep of their lives.
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Off-Grid Escape: This is as unplugged as it gets. The off-grid setup means you’re immersed in a raw, natural environment—while still having enough creature comforts to feel cozy.
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Always Safe: You’re never alone underground. Professional guides and technical staff stay on-site overnight to ensure everyone’s safety and comfort.
Why Stay Here?
For those seeking something beyond the typical spa weekend or lazy beach escape, Deep Sleep Hotel is an unforgettable choice. It’s equal parts adventure, history lesson, and wellness retreat wrapping adrenaline, culture, and rest into a single surreal experience.
Here, sleep isn’t just sleep it’s a world record-setting journey. And in the quiet depths of the Earth, surrounded by stone and silence, you may just find the best night’s rest of your life.
