I don't think I'd be in a hurry to cut a hole in
floor.....likely the water is winding up under the table only because that's the lowest place in the bilge for it to go.You didn't say what type of keel you have....but since you didn't mention keel bolts (there's generally good access to them) I'm guessing you have a swing and it's not uncommon for swing keels to 1) develope leakes around the trunk, or 2) to leak through areas such as the pivot pin etc from water just plain splashing around (I'm not at all familiar with the Cat swingkeel design).You haven't said how much water you're talking about. Could it be a thru-hull fitting of some kind? I've even heard of leaks coming from where the deck and hull join.No access to the water at all? I want to suggest that you haul the boat, dry the water up and visually inspect the hull, especially around that pesky trunk. If that doesn't show anything, take a garden hose and spray different areas and checking to see if the water again developes in the bilge.You don't have an easy problem to fix.Good Luck,Brad