More than 70% of Earth is covered by water, yet less than 10% of the ocean has been explored. From the mysterious Baltic Sea Anomaly and legends of Atlantis to claims of hidden underwater alien bases, ...

In 2011, a Swedish diving team searching for shipwrecks discovered a massive, circular formation deep beneath the Baltic Sea. Measuring roughly 60 meters wide and sitting 90 meters below the surface, ...

Add Yahoo as a preferred source to see more of our stories on Google. Less than 30 percent of the ocean seafloor has been mapped. It’s often said that we know more about the moon, than we do about the ...