Looking for suggestions on fin repair (hollow handl built SUP)

Hello members of SwayLock’s. My husband spent many months building this beautiful wooden SUP for me and today I hit a rock, damaged one of the fins and made a hole. It immediately started taking on water. I have no idea how to go about fixing it or what the best options even are. If anyone has any advice I’d be ever so grateful. (I am going to attach some photos)



Hi Laurie, sorry to hear about your troubles. It looks like a nice board and a nice day from the first picture.
The first step is getting the inside dry. If there are vent plugs or hatches I would open those.
Next would be to analyze the failure. It looks like the fin and fin glassing survived and the plywood was damaged. The way it cracked makes me wonder, is/was there a stringer or blocking under the fin?
Is your husband available to consult on and/or help with the repair?
There are quite a few HWB builders here, and a few more at https://www.woodboardforum.com/