Brave holidaymakers can spend the night sleeping at the bottom of a Victorian mine, 400m underground.

Anyone who loves an adventure and exploring the unusual will be blown away by this staycation destination that boasts the world's deepest underground bed.

Deep Sleep in Snowdonia, also known as Eryri National Park, in North Wales, described itself as "the deepest underground sleep on the planet… by far" thanks to its rooms which are built a staggering 1,375 vertical feet (419m) below the park's towering mountains.

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The experience may not be for those who have claustrophobia, but if your interest is peaked by the idea of sleeping under tonnes of rock and stone then it's definitely for you.

Plus, the photos you can take in the cavernous room are sure to be worth it for Instagram fans.

The Grotto – which sleeps two far below the ground – is an impressive space with a wooden floor, double bed and a wood burner.

But the walls are made of the natural cave walls with spiky, rugged natural rock surrounding your sleep space.

The journey down to your room also differs greatly from a traditional hotel.

Guests arrive in the evening and meet their guide near Blaenau Ffestiniog before heading off on a 45-minute walk up into the mountains.

The hike isn't for everyone as the way can get steep and rocky at times, but the views are outstanding from the top!

Guests will have to don their climbing kit with helmets, light harnesses and welly boots, ready to plunge into the dark of the largest and deepest abandoned slate mine in the world.

You'll have to manoeuvre your way through mining stairways, decaying bridges and tricky slopes.

During the hour-long mine trek, your instructor will share historical information, tidbits about the environment and comments on your 400m descent.

The adventure is perfect for explorers and at the end of the hike you'll spot the huge steel door that marks the entrance to the Deep Sleep room.

Inside there are actually several different accommodation options. Firstly, there are four small cabins which each come with two single beds, bedside table and a lamp. On the walls are scenic images of the mine to remind you of where you're sleeping.

The log cabins will make you feel like you're on an exploratory trip underground in the Victorian era. Perfect for history buffs.

But, there's also the Grotto Room which is the ultimate Deep Sleep experience. Surrounded by the cavern walls on your remote adventure camp trip you'll hear the drips, clicks and creaks of the mines around you – they're rarely silent.

The Grotto Room is a romantic space but does cost more than the cabin rooms. Your trip doesn't end with just a night underground though.

You'll enjoy an expedition-style meal together at a large covered picnic table before heading off to bed.

There's no need to be worried while you sleep as a member of technical staff and an instructor will remain in their own cabins during the night and you'll never be left alone in the mines.

When you wake at 8am you'll get a hot cup of tea or coffee before walking back up to the surface.

According to the people behind the conversion of the former slate mine, the camo is "the deepest underground sleep on the planet… by far." A night in one of the cabins will set you back £350 while the Grotto Room is £550.

You can book either option as a single occupant, but the price will remain the same no matter who stays inside.

Children over the age of 14 are permitted to stay at Deep Sleep.

Operations manager Mike Morris said: "Guests who have stayed there absolutely loved it. They like its uniqueness, the evening camaraderie and the sense of being away from civilisation.

"However the main observation has been the ability to get an amazing night’s sleep! Guests said they had a better night’s sleep than they ever manage at home – the best night’s sleep in their lives."

As Deep Sleep is not technically a hotel, but an expedition camp there are several warnings on the website for those taking part. They state that you should require a "moderate level of fitness and agility" due to the two hours of hiking and climbing.

Another states that while hay fever sufferers will find the mine a "welcome relief", there are a number of different strains of fungi in the caverns.

The Deep Sleep site states: "This should be a consideration for anybody with a serious allergy to fungi."

To create the camp was no easy feat for its creators! An abandoned tunnel was walled up to create the grotto, a short distance from the main camp. Getting the beds and timber shed sections down was more challenging.

"We had to abseil them down," said Mike. "We rigged up cargo lines and lowered them down shafts, which was easier than trying to manhandle them all down."

Thankfully, there is running, drinkable water in the cavern, but it will reach around 10C down there.

So bring a jumper and some warm PJs for the night – but be aware that everything you need for the night should fit into a small backpack you are able to carry on the hike and descent.

There is a simple toilet to use in the mine. You are not permitted to smoke or drink when in the mine though so leave the fizz until you return to the surface. You can book a night at Deep Sleep at go-below.co.uk.

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