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Natural wormhole on this Irish island; a ‘serpent’s lair’, according to folklore... Where years ago, locals believed that the unexplainable hole in the coastline was home to a dangerous sea creature :
A rectangular-shaped hole on Inis Mór Island, in Co Galway, has baffled people for centuries. The naturally eroded pool is commonly referred to as the Wormhole or Poll na bPéist, by the Irish-speaking locals.
The Wormhole got its name from the ancient Irish name, Poll na bPéist, which directly translates to the "hole of the worm". However, the "péist" they referred to in the past was far more intimidating than a lowly garden pest. The "péist" was a reptilian sea monster from Gaelic folklore that scared people into staying on land.
Despite its pool-like appearance, travel guides advise that tourists never swim in the wormhole. The strong and unpredictable currents make it dangerous. For other reasons, the locals also saw the wormhole as dangerous for many years. Folklore claimed that the unexplainable land feature was a "serpent’s lair" and home to the sea’s deadliest creature.
The péist was believed to live in lakes and rivers around Ireland, and they appear in many stories, in deadly battles against famous Irish legends and saints. It was believed that the wormhole on Inis Mór was a passageway for the creature to transfer from land to sea. Some believe that ancient locals sent sacrificial offerings through the hole to appease the péist, whom they feared.
Scientifically, unusual limestone rock formation was likely caused by a rare form of erosion. The hole has underground channels which connect to the ocean. When the tide is in, water rushes into the hole via an underground cave and forces the water over the edges, filling the hole from above.
The sharp cut edges of the wormhole make it look like it was crafted by a machine, but archaeologists confirm that the only one that had a hand in crafting it was Mother Nature.