803 Mediterranean's HIDDEN Volcano EXPLODES — Santorini Threatened After 400 Years

23 Feb 2026A hidden submarine volcano, Kolumbo, near Santorini, is showing signs of increased volcanic activity after 400 years of silence. Scientists have discovered a massive magma chamber beneath Kolumbo, connected to Santorini, posing a significant threat of explosive eruptions, tsunamis, and seismic activity. The potential eruption could rival the catastrophic Thera eruption of 1600 BCE, raising concerns about the safety of Santorini’s residents and tourists.A study using full waveform inversion revealed a massive, rapidly growing magma chamber beneath the Columbbo volcano, near Santorini. The chamber, expanding at an alarming rate, could potentially lead to a catastrophic eruption similar to the one in 1650. In 2025, a series of earthquakes near Santorini heightened concerns, leading to a state of emergency and evacuations.The Santorini caldera began inflating in mid-2024, indicating magma movement from a mid-crustal reservoir beneath Columbbo. This discovery highlights the interconnectedness of volcanic systems in the Mediterranean, posing a significant risk to the region’s 3.5 million annual tourists. While monitoring efforts have intensified, the growing magma chamber beneath Columbbo remains a persistent threat, with an eruption considered inevitable.