When sonar first picked up a massive, stair‑like object on the floor of the Baltic Sea, the image looked less like geology and more like a movie prop. The structure’s circular outline, sharp edges and ...

Deep below the chilly saltwater of the Bering Sea, strings of small holes dot the seafloor. The mysterious dots are scattered across the ground, decorations that look both natural and strange. Similar ...

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Scientists surveying the north Pacific seafloor found strings of openings dug into the ground, study says. Photo from Brandt et al. Deep below the chilly saltwater of the Bering Sea, strings of small ...