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by TeMPOraL 1879 days ago
It's a reference to a pg essay: http://www.paulgraham.com/submarine.html

The part introducing the term is at the beginning:

"Why do the media keep running stories saying suits are back? Because PR firms tell them to. One of the most surprising things I discovered during my brief business career was the existence of the PR industry, lurking like a huge, quiet submarine beneath the news. Of the stories you read in traditional media that aren't about politics, crimes, or disasters, more than half probably come from PR firms."