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The fastest man-made object is a manhole cover that was blasted into space by an underground nuclear test
It was “going like a bat!”
A 1.7 kiloton nuclear weapon was detonated in an underground tunnel at the Nevada Test Site (NTS) on September 19, 1957. The test, known as Rainier, was the first fully contained underground detonation and produced no radioactive fallout. A modified W-25 warhead weighing 218 pounds and measuring 25.7 inches in diameter and 17.4 inches in length was used for the test. But before scientists could design a fully contained nuclear test, they had a few blotched experiments. One of them became the stuff of legends. Credit: Public Domain.