Cold fusion is a topic close to my heart. The two gentlemen that you speak of, whose names escape me, were perpetrating a rather foolish hoax. Unfortunatley, they were totally unable to reproduce their results.
The problem with cold fusion is thatit is very close to theoretically impossible, or as my favourite author would say, infinitely improbable. A more likely source of unlimited energy is, in actual fact, hot fusion.
The problem with hot fusion is how to contain it, well contain it with magnets, but the ions line up on the magnetic lines, well make it a torus, but then they bunch up in north poles and south poles and don’t go anywhere etc etc etc… but you didn’t ask about hot fusion did you?
The answer to your question was they were nutbars, and no one has yet come even close.
Sincerely, SDStaff hopeful