Case file · Unidentified submerged object
The 'sunken city' off Cuba
In 2001 a Canadian survey team led by Paulina Zelitsky and Paul Weinzweig reported sonar images of geometric stone structures 600–750 metres deep off Cuba's Guanahacabibes Peninsula.
2001 CE · 21.95, -84.75 · status: claim
The account
Press reports called it an Atlantis-like city. Cuban geologist Manuel Iturralde said the features were unusual but probably natural and would need far more study.
The sceptical view
No follow-up dives or published scientific study confirmed artificial structures; at that depth, building would have had to predate any known culture by tens of thousands of years.