Cuba’s Underwater City

The Claim
There’s an ancient city 2000 feet underwater off the coast of Cuba
The site remained unknown until 2001, when a marine engineer, Pauline Zalitzki, and her husband were working on a survey mission alongside the Cuban government off the tip of the Guanahacabibes Peninsula in the Pinar del Río Province of Cuba.
They were scanning the seabed using advanced sonar to try to detect any deep-water shipwrecks and scanned an area of 2 square kilometres. Upon noticing a series of symmetrical shapes that appeared unnatural, they enhanced the image, and the above picture turned out.
Later that year, they returned with geologist Manuel Iturralde, a senior researcher of Cuba’s Natural History Museum, along with a remotely operated submersible vehicle to take pictures of the structure. It returned a series of images of granite stone that appears to have been carved by hand.
The blocks measured between 8 and 10 feet long, with some of them being stacked on top of one another and some standing alone. Since then, no more expeditions have taken place to the site, mostly because it is spread across an area between 2000 and 2460 feet deep, making it unreachable from diving and very expensive in a submarine.
The biggest question surrounding this is who built it, as it couldn’t have been built by humans, the reason being that the area was underwater well before modern humans were thought to have existed.
A marine geologist studying the case claimed it would have taken at least 50,000 years for a structure to sink so low underwater. Due to its position, it seems it always was underwater, as this area of land is thought to have been in the ice age 50,000 years ago, and although the sea levels are thought to have been lower, around 300 feet, it’s still a massive distance off the depth of the city.
Unfortunately, no one has conducted any major investigations into the site since its discovery, but due to its depth, this makes things very expensive and for nothing more than the promise that there “might” be something down there.
This also means that no one knows absolutely nothing about it, other than it contains granite blocks and has always been underwater, prompting many people to suggest that, yet again, aliens have built something on our planet, but given the location and age of this one, it seems they might be onto something.