Science: Test's Aftermath

After a few days delay to conceal the workings of their detection systems, U.S. authorities began last week to release a few details about the 30-megaton nuclear test in the Soviet Arctic. A 30-megaton explosion is not easy to hide. The island of Novaya Zemlya adjoins the international waters of the Barents Sea, and U.S. airplanes were presumably cruising near the Soviet test range. U.S. submarines were probably watching through periscopes, just as Russian submarines keep track of U.S. rocket shots from Cape Canaveral. Besides such eye and camera witnesses, the U.S. had a varied array of instruments to measure vibrations...

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