Posting photos check this link.
There are all sorts of places where you can have water enter the cabin of the 25. If it is definately from under the bunk area, then there two areas usually suspect:
1.) There is a brass strip down the center of the hull from gunnel height down to well under the bow when underway. Sometimes water leaks from these screw holes whay have been over drilled and into the actual area under the bunk. The remedy is to pull all of the screws of the brass strip, remove it, slightly over drill the screw holes and fill them with thickened epoxy, mill fiber,s cabosil and hi density West systems or equivalent. Then drill smaller hole, bed with 4000 or 5200 when you put the screws back in.
2.) The anchor locker. I have seen boats where the anchor locker drain hole is too low, and actually allows water to get into the bilge under the bunk. Also some boats have no floor on the anchor locker, so any water that comes in drains directly to the bilge. Fix, is to check where the hole for the drain is (usually covered by a SS clam shell.). Then check for a floor. If no floor, or the drain hole is the culprit, then make a new floor on the anchor locker, with a slope down to the drain--and be sure it is sealed completely off from the bilge. I won't go into the technique here, but if that is the case, PM or bring the subject back, and we can discuss various ways to build a floor at the anchor locker. (I have had to do this on 3 of the C Dorys I have owned. Also the Tom Cat came with no hole for the anchor locker to drain from.
A real improvement is to remove all of the foam under the bunk. My last 25 had that already done. I put two Li Fe PO4 100 amp hour batteries, a Multiplus 2000/80/50 inverter, spare anchors and rodes under the bunk area. You use of that area may vary.
If the water is coming from the back--that is a whole other hour's worth of information!!! It happens fairly frequently.
