If the car stopped - water got into the engine and locked it temporarily.
Usually this is one of the worse things that can happen to an engine and often requires engine replacement.
I can't tell how much water got in there, but if it was a good amount, I'd drain all of the oil and replace with fresh, pull the plugs, dry them off and crank with the plugs out to get anything that is in there out, etc.
My feeling, though - is that it still won't fire up - I can't say for sure, but I think it's something bigger than that.
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