Atlantic Ridge
From Tardis Wiki, the free Doctor Who reference
A version of Atlantis was found at the Atlantic Ridge, west of Gibraltar and south of the Azores. Around the 20th century, Professor Zaroff discovered the surviving Atlanteans and proposed to raise their settlement from the ocean floor. This would have destroyed the Earth. Zaroff died in the attempt due to the Second Doctor's intervention. (TV: The Underwater Menace)
