"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."

http://paulgraham.com/submarine.html

I'm not sure I agree with the assessment for this story. What would it be PR for? The stock market? Warren Buffett?

A story that comes up once in a while, like a submarine.

This(1) is the only submarine story I can think of.

1) https://en.wikipedia.org/wiki/Yellow_Submarine_(film)