Operation Plumbbob’s “Manhole Test” (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods. The test unintentionally launched the steel cap at an extraordinary speed, possibly exceeding Earth’s escape velocity (~11.2 km/s), making it one of the fastest manmade objects. Wh
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Operation Plumbbob’s “Manhole Test” (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods. The test unintentionally launched the steel cap at an extraordinary speed, possibly exceeding Earth’s escape velocity (~11.2 km/s), making it one of the fastest manmade objects. Wh
52.3K viewsJan 1, 2025
FacebookSpace Knowledge
Operation Plumbbob - 1957 - Nuclear Museum
Operation Plumbbob - 1957 - Nuclear Museum
Jun 6, 2014
nuclearmuseum.org
Operation Plumbbob: the fastest object ever (Pascal B)
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Operation Plumbbob: the fastest object ever (Pascal B)
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YouTubeWintz Studios
In 1957, during Operation Plumbbob, scientists detonated an underground nuclear test called Pascal-B. To seal the shaft, they used a 2,000-pound steel manhole cover. When the bomb went off, the pressure had nowhere to go. A high-speed camera caught the cover for one single frame—moving so fast it may have become the first human-made object to leave Earth. This was just 1 of 29 nuclear tests conducted in 1957 alone. ⸻ #OperationPlumbbob #HiddenHistory #ColdWar #ScienceFacts #DidYouKnow
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In 1957, during Operation Plumbbob, scientists detonated an underground nuclear test called Pascal-B. To seal the shaft, they used a 2,000-pound steel manhole cover. When the bomb went off, the pressure had nowhere to go. A high-speed camera caught the cover for one single frame—moving so fast it may have become the first human-made object to leave Earth. This was just 1 of 29 nuclear tests conducted in 1957 alone. ⸻ #OperationPlumbbob #HiddenHistory #ColdWar #ScienceFacts #DidYouKnow
12.7K views3 months ago
TikTokwintzstudios
The Factonaut on Instagram: "Operation Plumbbob's "Manhole Test" (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods. The test unintentionally launched the steel cap at an extraordinary speed, possibly exceeding Earth's escape velocity (~11.2 km/s), making it one of th
The Factonaut on Instagram: "Operation Plumbbob's "Manhole Test" (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods. The test unintentionally launched the steel cap at an extraordinary speed, possibly exceeding Earth's escape velocity (~11.2 km/s), making it one of th
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The Fastest Man-Made Object: The Truth Behind the "Nuclear Manhole Cover."
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The Fastest Man-Made Object: The Truth Behind the "Nuclear Manhole Cover."
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The Galactic Void • The Void Network by Jose Fontela on Instagram: "Operation Plumbbob’s “Manhole Test” (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods."
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The Galactic Void • The Void Network by Jose Fontela on Instagram: "Operation Plumbbob’s “Manhole Test” (officially known as Pascal-B) was a U.S. nuclear test conducted in 1957 at the Nevada Test Site. It involved detonating a small nuclear device in a deep underground shaft capped with a steel manhole cover. The goal was to study high-energy explosive effects and containment methods."
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The Manhole Cover That Almost Reached Space Enter the high-speed mystery of Pascal‑B. In August 1957, during the Operation Plumbbob nuclear test series at the Nevada Test Site, a massive steel cap (commonly referred to as a “manhole cover”) was blasted off a shaft by a shock-wave caused by the underground detonation. Camera footage captured the cap only for a single frame—leading to speculative estimates that it reached velocities exceeding 60 km/s (≈216,000 km/h)—many times Earth's escape veloc
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