What specific explosion in July 1969 was a particularly devastating failure for the Soviet lunar effort?

Answer

The second N1 test launch

The second N1 test, conducted in July 1969 just weeks before Apollo 11, resulted in the largest non-nuclear explosion recorded up to that point.

What specific explosion in July 1969 was a particularly devastating failure for the Soviet lunar effort?

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Why Russia Did Not Put a Man on the Moon - YouTube

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