1957 Operation Plumbbob: The Manhole Cover That Might Still Be in Space! In 1957, during Operation Plumbbob, the U.S. conducted a nuclear experiment that launched a 900 kg steel manhole cover into the sky — in just one second! Was it fast enough to escape Earth’s gravity forever? Could it still be drifting somewhere in the universe, or did it mysteriously fall back to Earth? Discover the mind-blowing true story of one of history’s strangest scientific experiments! 📌 Subscribe for more amazing s
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A manhole cover launched into space with a nuclear test is the fastest human-made object. A scientist on Operation Plumbbob told us the unbelievable story.
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In 1957, scientists might’ve accidentally made space history with a manhole cover. During a nuclear test in Nevada, a steel cap sealed over a deep shaft was blasted into the sky at an estimated 125,000 mph. That’s five times the speed needed to leave Earth! Only one blurry frame on a high-speed camera caught it before it vanished. Some say it burned up in the atmosphere, others think it might’ve become humanity’s first object in space even before Sputnik. Either way, it's one wild Cold War myste
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