Will my waterproof iPhone get water damage if I wet it while it has a tiny crack?

I have an iPhone 8 which is waterproof but I have a very TINY crack on the screen, you can't see it unless you look for it. I only noticed it was there because I felt it when scrolling on it. My question is, could I still get my phone wet or will it break because the water will go through the crack? I used to love taking it into the ocean with me and I'd like to take it with me while I go tubing.

Consider if you had a boat and it had a small hole in the bottom - do you think it would let in water because it is a small hole?

Taking it into the ocean if foolish.
We can't tell you if it will leak or not.

If it does, however, salt water will be 100 times more destructive than fresh water because the salt will corrode the components - possibly to the point that they can't be repaired.

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