9 Unsolved Ocean Mysteries

Is space the final frontier, or is the human brain? Arguments could be made for either, but there’s a whole lot of evidence that we don’t know much about the ocean. Which makes it a serious contender for “the biggest mystery holder” out there.

Here are 9 of those oceanic mysteries.

Cuba’s underwater city

Deep in the waters off Cuba’s coast, researchers discovered unusual formations of smooth blocks, crests, and geometric shapes. The Canadian exploration company that discovered the formations, Advanced Digital Communications, has suggested that they could be the buildings and monuments of an early, unknown American civilization.