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  2. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    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; 7.619 mi) in 1989. [1]

  3. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

  4. Big Hole - Wikipedia

    en.wikipedia.org/wiki/Big_Hole

    The Big Hole has a surface of 17 hectares (42 acres) and is 463 metres (1,519 ft) wide. It was excavated to a depth of 240 metres (790 ft), but then partially infilled with debris reducing its depth to about 215 metres (705 ft). Since then it has accumulated about 40 metres (130 ft) of water, leaving 175 metres (574 ft) of the hole visible.

  5. What's inside the world's deepest hole?

    www.aol.com/news/whats-inside-worlds-deepest...

    Home & Garden. Medicare. News

  6. Great Blue Hole - Wikipedia

    en.wikipedia.org/wiki/Great_Blue_Hole

    The Great Blue Hole is near the center of the photo­graph. The Great Blue Hole is a large marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 70 km (43 mi) from the mainland and Belize City. The hole is circular in shape, 318 m (1,043 ft) across and 124 m (407 ft) deep.

  7. ‘Blue hole’ is largest ever discovered at 1.3K feet deep ...

    www.aol.com/blue-hole-largest-ever-discovered...

    Indeed, while TBJH was initially discovered in 2021, scientists only measured its depth down to 900 feet due to limitations in the echo-sounder technology — which calculates speed based on sound ...

  8. Black Hole Size Comparison Chart Gives New View of Universe

    www.aol.com/news/black-hole-size-comparison...

    The post Black Hole Size Comparison Chart Gives New View of Universe appeared first on Nerdist. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290 ...

  9. List of impact structures on Earth - Wikipedia

    en.wikipedia.org/wiki/List_of_impact_structures...

    Less than ten thousand years old, and with a diameter of 100 m (330 ft) or more. The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2]

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