Kola Superdeep Borehole Welded Shut
Oct. 4, 2024
Kola Superdeep Borehole - Wikipedia The deepest hole we have ever dug - BBC Future Kola Superdeep Borehole – Murmansk, Russia - Atlas Obscura Kola Superdeep Borehole Welded Shut
Oct. 4, 2024
Kola Superdeep Borehole - Wikipedia The deepest hole we have ever dug - BBC Future Kola Superdeep Borehole – Murmansk, Russia - Atlas Obscura Kola Superdeep Borehole Welded Shut