For thousands of years people have dedicated days, months and even their lives to trying to find Atlantis, the mythical lost city engulfed by the ocean.
Despite all efforts, none have come up with a conclusive location.
However it turns out the supposed sunken island may have been hiding off the coast of Cornwall all along.
In 1997 a team from the Moscow Institute of Meta-History said it found Atlantis 100 miles off Land's End.
More than 2,300 years after Plato told the story of Atlantis, the myth is still famous and inspires writers, film-makers, artists and even scientists.
In his texts, Timaeus and Critias, a dialogue in two parts which explores the themes of utopia - an anachronism as the word was created by Sir Thomas More in the 16th century - ideal states and mighty civilizations, the Greek philosopher relates how Atlantis was founded by demi-gods 9,000 years before his own time.
According to the story, Atlantis was first allotted to Poseidon, the god of the sea, and was then passed on to his descendants' firstborn for many generations.
The civilization they created was prosperous and powerful. They were respectful of the gods and described as gentle and wise.
But as the Atlanteans were becoming more and more human - they became corrupt.
They besieged Athens but failed. The story concludes with Atlantis falling out of favour with the deities and submerging into the Atlantic Ocean.
People have since been fascinated by Plato's political allegory, and for millennia found possible evidence of Atlantis in the Canary Islands, the Azores, the North Sea, Andalusia, Antartica, the Caribbeans, the Bahamas, the Bermuda Triangle, Indonesia, India, etc.
A detailed map was even drawn in 1664 by German scholar by Athanasius Kircher.
In December 23 years ago, the Moscow Institute of Meta-History decided it would lead an expedition off Land's End to find Atlantis.
After re-reading Plato's texts, the Russian team thought that the lost island was located at Little Sole Bank, a sand bank south west of Cornwall.
However, it is reported that they did not have enough funds to go on the expedition.
It was the last time Cornwall was mentioned as a possible location for the fictional island - until last year, when the British Ports Association revealed that the possible discovery of Atlantis off the coast of Cornwall would lead to the construction of a revolutionary floating port.
But the unbelievable announcement was made... on April Fools' Day.
In an amusing press release, the association joked that the sunken city had been found 100 miles west of the Isles of Scilly and that a £50m floating port facility was being planned to house almost 200 specialist marine archeologists and ships which were expected to head to the region in the coming months.
According to the Cornish folklore, there is a city that sunk into the ocean centuries ago.
The legend, immortalised in the poetry of Alfred Lord Tennyson, says that the lost land of Lyonesse, located off Land's End, was engulfed by a huge tidal wave.
It was a rich land with fair-sized towns and as many as 140 churches.
Some say that it is where King Arthur fought his last battle against Mordred and others, like Thomas Mallory, claimed it was the birthplace of Iseult's lover Tristan.
Lyonesse is said to have been swallowed by the sea in a single night, never to be seen again.
The catastrophe left only two survivors - a man called Trevillian and his white horse.
Since then, local fishermen have been said to have pulled up stones from the buildings of the lost city in their nets and, to this day, the bells of long-submerged churches can be heard ringing beneath the waves on still nights.
Others say the domes and spires of Lyonesse can be seen in the sea when standing on the cliffs at Land’s End.
In 2016, a tidal study inspired by the myth was released.
The Lyonesse Project, which studied the impact of rising sea levels on the Isles of Scilly over the past 12,000 years, was published by Cornwall Council after seven years of work.
Since the mid-18th century archaeological remains, including stone walls, have been discovered below high water in the Isles of Scilly – which were one large island 9,000 years ago and commonly associated with the enigmatic lost land of Lyonesse.
"The new data shows that the 500-year period between 2,500BC and 2,000BC saw the most rapid loss of land at any time in the history of Scilly — equivalent to losing two-thirds of the entire modern area of the islands," Charlie Johns, archaeology projects officer from Cornwall Archaeological Unit, said when the results were published.
"After this the rate of change slowed. By about 1,500BC the pattern of islands was approaching that of today, but with the dramatic difference of a vast intertidal area of saltmarsh in what is now the islands’ inner lagoon.
"Much of this would have remained useful land, especially for grazing animal stock, and would have been passable with ease almost all of the time."
The project was commissioned by Historic England after a local diver, Todd Stevens, discovered a submerged forest in St Mary’s Road.
Scientists analysed samples of pollen and peat recovered from a variety of sites during the project, including the submerged forest and beaches.
The aim of the project was to recreate the evolution of the physical environment of Scilly during the Holocene, examine the progressive occupation of this changing coastal landscape by early peoples, explore past and present climate change and sea level.
The project was carried out between 2009 and 2013 by Cornwall Council's Cornwall Archaeological Unit with a team of experts from Oxford, Exeter, Plymouth, Cardiff, Aberystwyth and Glasgow universities as well as Historic England’s Scientific Dating Team and volunteers from the Cornwall and Isles of Scilly Maritime Archaeological Society and the Islands Maritime Archaeology Group.