The first thing I would do is radio a Pan Pan with my fix and the fact that I'm taking water - update to follow.
That way at least someone knows where I am and that I have a problem.
Then I'd set about the other stuff like where is it, what is it, how do I fix it, etc.
If the water is coming in that fast that you haven't time for a pan-call, make it a mayday and get ready to leave.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke