Even 32 kilometers (20 miles) away, observers felt the heat of the explosion on exposed skin. The radiation level in the rising mushroom cloud was so intense that it emitted a blue glow.
All of these declassified eyewitness accounts were stamped "Secret." Classification-declassification markings are omitted here.
Eyewitness accounts of the Trinity test by:
Luis W. Alvarez
Edwin M. McMillan
Maurice M. Shapiro
Cyril S. Smith
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