Well at least in the part you have accessed you found little water so that at least is not where the undesired onboarded water is. Process of elimination, knowing where it isn't aides in determining where it might be.
Some boats have very poor access to below floor deck
spaces. That is when it can become necessary to remove things, or even drill small holes to allow for sighting or dipping a dry stick to find standing accumulations of water. A simple problem can become a tough problem if the boat is constructed without access designed into it.
Why Internal Hull Areas Should Be Accessible
Are There Bogymen in Your Basement?
by David Pascoe
During the last several months we've encountered numerous boats that have concealed compartments within the hull. We've long advanced the argument that builders should make as much of the interior
of a hull as accessible as reasonably possible. Instead, the opposite, has occurred where a majority of builders today are building boats in such a way as that almost NO area of the internal hull is accessible. Not even the bilges.
Apparently either one of two things is happening. Either the builders are too stupid to know any better, or -- and we hope this isn't true -- the builders who do this think their customers are too stupid to know any better. Though surely they can't believe that there aren't some surveyors around who will fail to show this situation up for what it really is.
Creating concealed compartments in a boat hull defies all common sense and principles of good boat building for a wide variety of reasons, not the least of which was exemplified by several 10 year old Sea Ray
boats that we recently looked at.
What is meant by concealed compartments are areas under the cabin sole
which are separated and divided by stringers and bulkheads, and covered over by the cabin sole
with no hatches. What you end up with are fairly large void spaces beneath the deck
for which there is no way of knowing what is going on down there because the area cannot be seen.
Let's say that you hit something and poked a small hole in the hull. There's no way you could get at the hole to temporarily plug
it up and possibly save the boat from sinking. Naturally, that sort of thing only happens to other people.
. . .
Well I hope you got the leak under control so as to stablize the situation for a while, now the hard part is to remove the water. Good luck in your search and resolution.