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Why the deepest hole on Earth was sealed, and what they discovered before it was closed

Deep in the Arctic Circle, there’s a man-made hole that once earned the nickname “the entrance to hell.” The Kola Superdeep ...
Morning Overview on MSN

The world’s deepest hole once dubbed the entrance to hell is now sealed

The deepest man-made hole on Earth is no longer a gaping wound in the Arctic rock but a quiet, sealed scar. Once hyped as a literal “entrance to hell” in feverish urban legends, the Kola Superdeep ...