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2. Operation Plumbbob - Wikipedia

   en.wikipedia.org/wiki/Operation_Plumbbob

   The operation consisted of 29 explosions, of which only two did not produce any nuclear yield.Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of warheads for intercontinental and intermediate range missiles, they also tested air defense and anti-submarine warheads with smaller yields.

3. Peaceful nuclear explosion - Wikipedia

   en.wikipedia.org/wiki/Peaceful_nuclear_explosion

   Although likely never achieving orbit due to aerodynamic drag, the first macroscopic object to obtain Earth orbital velocity was a "900kg manhole cover" propelled by the somewhat focused detonation of test shot Pascal-B in August 1957. The use of a subterranean shaft and nuclear device to propel an object to escape velocity has since been ...

4. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

5. Five times a manhole cover stopped F1 in its tracks

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6. Answer Woman: Who makes the manhole covers with river ...

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   A reader asks for details about the Metropolitan Sewerage District's designed manhole covers. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways ...

7. Talk:Operation Plumbbob - Wikipedia

   en.wikipedia.org/wiki/Talk:Operation_Plumbbob

   The 300 ton Pascal-B explosion, exploding with 1.26 TJ of energy, will blast the manhole cover off of the shaft at 26.4 km/s, if it does this with 100% efficiency. This is over twice the escape velocity of earth (11.2 km/s).

8. Bubbling green sludge leaks from New York City manhole cover ...

   www.aol.com/bubbling-green-sludge-leaks-york...

   A bright green liquid leaked from a New York City manhole cover in bizarre footage. There's literal green sludge bubbling up from the ground next to World Trade Center right now,” Dan Pantelo ...

9. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...