Wet stringer foam question

[bigeasy1]

Thanks for all the replies,if anyone has anymore thoughts,feel free to keep em coming.

I have checked the hull bottom,and it's good,but it's very hard to tell if the noise is different on one side versus the other.The stringer that's wet seems to sound just a bit duller when i tap on it,in the compartment where the fuel tank was.Even there, the difference in sound is almost imperceptable.

I'm wondering if it got wet from the stern area and was working it's way foward,guess i'll find out after i drill a few holes further foward.