Is your child's life/safety enough to overcome your fear?

I'm afraid of some things but my major phobia is beaches/oceans. I can swim but panic if the water is too deep (7ft and above), is too far and there is nothing to grab in to. Yes I'm afraid of deep water. I can handle other fears but that. Anything but that.

Lets say in the worst case scenario:
If I had a child and he/she was struggling on deep waters, had nothing to grab and in the process of drowning... would that be enough to overcome my major phobia?
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I don't have kids yet and just like everyone else, we all have fears. I just imagine that if your child happens to be in harm's way and it deals with your own phobia... then that would be enough to overcome it even if it meant you get harm in the process.
Is your child's life/safety enough to overcome your fear?
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