• The world’s deepest underground hotel has opened in Wales. 

• Located 1,375 feet below ground in the world’s largest and deepest abandoned slate mine turned into accommodation.

• Guests can sleep in a romantic grotto. 

• Wi-fi is provided but there’s no mobile phone reception. 

• Taps have running water from a spring within the mine.

• Electricity comes from batteries powered by falling water. 

Having trouble sleeping? Well, a new accommodation provider in Wales can guarantee you the deepest sleep of your life. 

  In a unique fusion of adventure and accommodation, Wales has welcomed the grand opening of Deep Sleep, a hotel that takes slumber to unparalleled depths. 

  Nestled beneath the mountains of Eryri National Park, this subterranean haven is situated a jaw-dropping 1,375 vertical feet below ground level, making it the deepest underground sleep experience on the planet.

  The brainchild of Miles Moulding, the visionary founder of Go Below — an established underground adventure company — the newly unveiled Deep Sleep promises intrepid guests an off-grid escapade like no other. 

  Go Below already delights visitors with tours that involve activities such as zip lining, traversing waterfalls, and boating on subterranean lakes.

  Deep Sleep beckons the daring to embark on an extraordinary journey. Arriving at the Tanygrisiau Base near Blaenau Ffestiniog, adventurers meet their trip leader. From there, a 45-minute uphill walk amid the Snowdonia mountain scenery sets the stage for the immersive experience that lies ahead.

  Guests are equipped with helmets, lights, harnesses, and Wellington boots. Then they bid adieu to daylight as they descend into the sprawling labyrinth of the world’s largest and deepest abandoned slate mine.  

  After an hour of walking and scrambling, they find themselves more than 419 metres beneath the surface, greeted by a formidable steel door that marks the entrance to Deep Sleep. Refreshments await to set the stage for an unforgettable evening. 

  The mine provides an ambient all-year-round temperature of 10 degrees Celsius. This is definitely chilly, but about the same as the night temperature in Wales during June and September. 

  Deep Sleep has wi-fi, provided through a 1km long armoured Ethernet cable from a 4G antenna on the surface. There is, however, no mobile phone reception. 

  There is a toilet that works a bit like a composting toilet. 

  All electric lighting (and the wi-fi!) in Deep Sleep is low-voltage and powered from 12v batteries. These batteries are charged by the force of falling water within the mine itself, using micro-
hydro turbines. 

  There are taps with running water that comes from a spring within the mine itself.

  Deep Sleep boasts four private twin-bed cabins and a romantic grotto featuring a double bed. The rustic charm of the accommodations, combined with the extraordinary surroundings, promises an otherworldly experience. You’ll find more information here.

July 2023.