Expert Answers » Nuclear Testing
Nuclear Testing Glossary Definition (English)

Underground Defined
The following is in context to Nuclear Testing, because it's common for a single word to have multiple meanings you will find additional research links near the bottom of the page.
"Underground nuclear test conducted in a tunnel or at the bottom of a drilled hole or shaft. Some underground nuclear tests were not designed to contain all radioactivity; e.g., cratering tests or safety experiments."
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