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I have had some moisture in a few areas but none didn't go deeper than 1 inch, then the foam was dry.
At the drain tube in the bow hatch it was only 1/2 inch wet foam. I simply removed the wet foam and refilled with polyester and glas mix.
Try to remove some wet foam max 1/2-1 inch first. If still wet you can drill a hole in the keel righ below the drain tube. If it doesn't come out any water from that hole I wouldn't worry at all. If it does, go with the fan in the hatch and let dry for as long as you can. Repair the drilled hole with epoxy.