Put about a hundred pounds of dri ice inside and close it up tight tape the openings This will drive off the oxygen and sufficate the little beasties. Be carefull when you go back in.
Are you serious about this? do you know if it has worked? I would be worried about the damage it might do to the floor surface of the boat.
Would you suggest putting the ice in a special container that would disperse the temp on the surface?
Gosh, this sounds like "Ask Heloise" household advice column.
Thanks for the reply, Jody