known of the deep ocean.

[keannu]

I learned that "of" is for an instant short information that reminds you of something, while "about" is for detailed information for contemplation.
But in the following example, even if we replace it with "about", does it mean the same thing? Or do they use both "known about" and "known of" without virtually any difference?

ex)Until the late 1800s, almost nothing was known of the deep ocean.

[billmcd]

I learned that "of" is for an instant short information that reminds you of something, while "about" is for detailed information for contemplation.
But in the following example, even if we replace it with "with", does it mean the same thing? Or do they use both "known about" and "known of" without virtually any difference?

ex)Until the late 1800s, almost nothing was known of the deep ocean.

"With" would not be correct. "Of" or "about" is OK.

[keannu]

"With" would not be correct. "Of" or "about" is OK.

No, I mean what's the difference between of and about here.

[emsr2d2]

No, I mean what's the difference between of and about here.

There's no real difference between "of" and " about" in your specific example.

In your original question you did ask what it would mean if you replaced it with "with". I don't think that's what you meant to type.