Out of the Blue vs. Into the Blue: how are they different?

Hi Everyone,

What does the catch phrase 'out of the blue' mean to you? i.e. An old friend from high school called me out of the blue. Generally speaking, I think it means something that occurred unexpectedly

Now, what does the catch phrase 'into the blue' mean to you? i.e. We are heading into the blue. I think it means something that is unknown.

Thanks for your thoughts and opinions :-)

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