It is probably water trapped in the keel. It can stink worse than a black water holding tank. The keel may be filled with something like concrete with the water filling any voids. Had a Trojan that had a hollow keel that filled with water. Stank badly. Cut it open so it would not trap water but it was not filled with anything. If you can only poke in a short distance it is probably filled or mostly filled. Good luck draining it. I tried flushing mine, but it never stopped smelling until I opened it up and cleaned it out thoroughly.
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