An American architect used sonar in 2004 to reveal man-made walls a mile deep in the Mediterranean between Cyprus and Syria.
In 2007, Swedish researchers claimed the city lay on the Dogger Bank in the North Sea, which was submerged in the Bronze Age.
And as recently as February of this year, what appeared to be grid-like lines that resembled city streets were spotted on Google Earth - in the ocean off the coast of Africa.
Sadly Google itself quickly debunked the suggestion, explaining that the lines were left by a boat as it collected data for the application.