Ok, let the old fart speak.
Wood is not incorporated into the hull or deck except for the mast base, motor and a few other areas. What basically you have is construction foam that not only acts for buoyancy should the boat try to sink but also structural. I suspect that it has separated and you may be feeling the void between the outer plastic skin and the construction foam.
The first thing would need inspection or a photo of the affected area outlined of course by pencil to see what is occurring as repairs differ on the location. Secondly, the boat would need to be out of the water under roof for a minimum of 6 weeks for the interior to dry with the front tilted up and the drain plug on the back end open for water to escape.
Again, location is a key as to how I would approach but when dry, I would force the construction foam back in place with gorilla glue. Learned that little technique years ago. On top, I would drill a few holes pouring a large amount of Gorilla glue into the holes and using air, I would then spread that glue out. I would then place some boards down and put weights on it to flatten out the outer skin and let sit for 24 hours. To fill the holes up, I would plexisus. Eddie at Hunter might direct you where to get it but any good and expensive plastic bonding weld style glues can be used to fill up the holes, sanded smooth and spray painted with plastic Krylon white to match the white skin. Forget about trying to use two part epoxies, silicon and even 5200 in this repair.
The hull is another as you are dealing with flat and curvature areas. Flat areas about the same if the skin is raised up. In the curved areas, I had to drill holes and again spread gorilla glue with air. However, I had to insert various things to bring the foam backing up against the skin if that was the case in the event the foam had backed off without the outer skin bulging..
I hope this helps to answer your questions.