Scientists Spotted Perfectly Symmetrical Structures 600 Meters Deep Off Cuba’s Ocean Floor, and They Still Have No Clear Explanation

A deep-sea survey near Cuba in 2001 revealed strangely geometric structures sitting nearly 600 meters below the surface. Some researchers thought they might be the remains of an ancient city, while others quickly urged caution.

The discovery came from a mission led by Advanced Digital Communications, a Canadian company originally searching for old shipwrecks in an area known for Spanish colonial-era remains. Instead of broken ships, sonar scans picked up patterns that looked surprisingly organized.

With such extreme depth, the site has rarely been revisited, leaving its story hovering between promise and uncertainty.

Sonar Signals Hard to Explain

The first clues came from side-scan sonar images showing shapes that looked symmetrical and repetitive across the ocean floor. According to the South Florida Sun-Sentinel, these patterns stood out because they did not resemble the usual randomness of natural formations. Researcher Paul Weinzweig said that:

“The structures we found on the side scan sonar simply are not explicable from a geological point of view. There is too much organization, too much symmetry, too much repetition of form.”

When they returned with an underwater robot, they found large stone blocks scattered across the seabed. Some appeared smooth and rectangular, others circular, and a few even looked like small pyramids.

A Possible Lost Urban Complex?

The idea of a submerged city quickly gained attention. The team member Paulina Zelitsky said in an interview with the BBC that the site looked like a “large urban centre,” but she also made it clear that there was not enough evidence to confirm that.

Weinzweig suggested the formations could be around 6,000 years old. That would make them older than the Egyptian pyramids, which is a bold claim and one that would seriously shake up what we know about early civilizations in the New World.

Even so, the claim hasn’t persuaded most scientists. The timeline raises red flags, particularly given the lack of comparable structures in the area.

Scientists Question the Idea, Geology Limits It

Many specialists remain doubtful. As mentioned by South Florida Sun-Sentinel, Michael Faught, an expert in underwater archaeology at Florida State University, stated that:

“It would be cool if Zelitsky and Weinzweig were right, but it would be really advanced for anything we would see in the New World for that time frame. The structures are out of time and out of place.” 

Geological analysis further complicates the hypothesis. Manuel Iturralde, a geologist at Cuba’s National Museum of Natural History, explained, as reported by BBC News, that the depth of the structures presents a major inconsistency. Known tectonic processes would require at least 50,000 years for land to submerge to such levels, far exceeding the estimated age proposed by the discovery team.

Researchers from the University of Southampton estimate that more than 80% of the ocean floor remains uncharted. At the same time, some of these formations may appear organized due to natural forces, mimicking human-made designs. However, limited follow-up at such sites is common, largely due to the extreme depth and the high cost of exploration.

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