There’ll be no fears of being woken early by birdsong through an open window at this ‘hotel’, mainly because there are no windows at this ‘hotel’.

Located around 1,375ft (429m) below the mountains of Snowdonia in Wales, ‘Deep Sleep’ claims to be deepest hotel in the world, the venue comprising four twin-bed cabins and ‘romantic’ room complete with double bed.

With peace and quiet virtually guaranteed, Deep Sleep is run by the Go Below activity company and describes itself as a “remote camp adventure experience”.

But if you’re expecting a relaxing lift descent taking you to your room at the venue near Blaenau Ffestiniog, you’re in for a disappointment, as getting to the rooms first involves an overland 30-minute trek into the mountains before the descent begins: arriving at a cottage you’re kitted out with a harness, light and helmet for a real adventure.

According to the company website, its then time to “head into the depths of the world’s largest and deepest abandoned slate mine”. Guests navigate through ancient stairways – mining ended at the site around 1939 – along with decaying bridges and the occasional scramble, the route into the mine taking up to an hour.

You do get a guide and the hotel entrance is marked by a large steel door. The cost for the ‘romantic’ grotto is £550 per night, and a twin comes in at £350 per night, including an ‘expedition-style’ meal with a breakfast of snacks and a warm drink served the following morning, before your trek back to the surface.

The guide and a member of the hotel’s technical staff also stay overnight and, before you ask, yes, there is WiFi, provided through a 1km cable from a 4G antenna on the surface.