The Gulf of Bothnia 60-Meter Circular Anomaly: From Speculation to Natural Explanation
To the point
Peter Lindberg, Dennis Åsberg and the OceanX team used sonar in 2011 to image a 60‑meter circular feature on the Gulf of Bothnia seafloor, and although some speculated about a sunken monument or UFO, most scientists such as Charles Paull, Göran Ekberg, Martin Jakobsson and Jarmo Korteniemi say it is a natural glacial formation made of rocks like granite, gneiss, sandstone and basalt, with evidence pointing to glacial and postglacial processes, while others warn the sonar could be distorted by miswiring and propose natural explanations such as a rock outcrop, a drumlin or pillow basalt, and media interest has continued, including a 2018 Swedish documentary The Mystery Beneath, though the natural origin remains the prevailing view.
