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The sound travels through the ocean, bounces off the seafloor, then travels back to the ships.

These sonar readings are typically taken by ships towing submersible devices that send out sound waves. Oceanographers use sonar-sound waves-to map the ocean bottom. These lines are artifacts of the ocean floor mapping process. In other words, there are no physical lines on the ocean floor. While these formations are human-made, they are only made of data. These formations look like they were made by humans, leading many to ask if these areas could be lost cities or underwater streets. With legions of people around the world now exploring the seafloor, many are noticing locations along the ocean bottom marked by mysterious formations of grid-like artifacts. Recently, many of these tools have been updated to provide detailed seafloor mapping data, or bathymetry. With the advent of online mapping tools such as Google Earth, exploring our planet is easier than ever before.