The Soviet SOKS system detected nuclear submarines by their radiation trace. CIA declassified it in 2017.
When academic papers on a topic suddenly stop appearing, that field often went classified.
The visible edge is never the real edge.

The Soviet SOKS system detected nuclear submarines by their radiation trace. CIA declassified it in 2017.
When academic papers on a topic suddenly stop appearing, that field often went classified.
The visible edge is never the real edge.
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