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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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