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How much water did you drive through?
I've seen many engines that ingest water and then won't start.
Can your son inspect the airbox for high water entry please?
Oh Cathy, that's a lot of water depth.
Is your son mechanically minded?
Can he inspect the engine airbox internals for water please?
Hope the engine hasn't "drowned".
Let's hope it is an electrical, and not mechanical issue.
Hopefully for you and your family it is not bad news from your mechanic.