The Cuban underwater formation is a site thought to be a submerged granite structural complex off the coast of the Guanahacabibes Peninsula in the Pinar del Río Province of Cuba.

[1][4] The discovery was reported by Paulina Zelitsky, a marine engineer, and her husband Paul Weinzweig, owners of a Canadian company called Advanced Digital Communications,[5] working on an exploration and survey mission in conjunction with the Cuban government.

The team returned to the site a second time with an underwater remotely operated vehicle that filmed sonar images interpreted as various pyramids and circular structures made out of massive, smooth blocks of stone that resembled hewn granite.

"[1] After studying the images National Geographic senior editor John Echave said: "They are interesting anomalies, but that's as much as anyone can say right now, but I'm no expert on sonar and until we are able to actually go down there and see, it will be difficult to characterize them.

A specialist in underwater archaeology at Florida State University added: "It would be cool if they were right, but it would be real advanced for anything we would see in the New World for that time frame.