A NEW attraction could open in Wales in a former underground reservoir.

In the north of Wales, near the town of Llandudno, you’ll find Happy Valley– no, not the TV series, but a historic public park with terraced gardens, a tea pavilion and coastal views.

A reservoir underneath a park in Wales could soon be transformed into an attraction

For a century, visitors have been heading to the park and enjoying it – yet right under their feet is an abandoned reservoir.

Known as the ‘Jattvibeken Palace’ and said to feel like “an underground cathedral” according to its owners, the reservoir could open up as an attraction in the future.

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It features vaulted ceilings stretching nearly six metres high, 248 red brick arches and spans around a third of an acre.

The attraction dubbed ‘Llandudno Vaults’, would be a year-round immersive arts venue “where Welsh myths and creatures are brought vividly to life through storytelling, music, and interactive technology”, according to the attraction’s website.

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There would also be a new entrance created on the Happy Valley hillside.

So far, the project has secured £20,000 to take a step towards opening.

Fach reservoir was built in the latter half of the 19th century and opened under the park to help water shortages in the coastal region.

When the reservoir was used, it used to be around 3.6metres deep and hold up to a million gallons of water.

Called Llududno Vaults, the experience would be based on Welsh mythical creatures

The team behind the project are set to seek planning permission later in the year Credit: Llandudno Vaults PR

However, by the mid 20th century there was a need for even more water and the reservoir was scrapped.

For decades, the hidden network of waterways has sat untouched, with the only access being through a manhole.

According to North Wales Live, Andy White, Managing Director of Llandudno Vaults, said: “For more than a century, thousands of people have walked across Happy Valley without realising what’s beneath their feet.

“The reservoir is one of North Wales’ hidden engineering treasures, and our ambition is to reveal it in a way that respects its history while creating a completely new visitor experience.”

Planning permission for the attraction will be submitted later this year.