Kola Superdeep Borehole

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft) in 1989.

Excerpt from the Wikipedia article “Kola Superdeep Borehole”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Шелковников Евгений Анатольевич, CC BY-SA 4.0, via Wikimedia Commons.