According to the theory, it fell victim to a great shift in postion on the earth. It is, according to the theory, now the artic continant. During the shift floods and earth quakes destroyed the city. This is thought to be true according to some. But there is very little proof.
Hundreds say yes due to their sightings.
Radar imaging has located several large masses under water. Then some may have been trapped in lochs and lakes. The odds are astromical. Almost always described with large heads.