Worst I saw were some shotguns stolen in a burglary and the thief was unsure what to do with them so wrapped them in hessian sacking material and put them in an old diesel storeage tank with some diesel still in the bottom. Mostly high grade Berretas and Brownings and a decent Westley Richards. The wood had rotted and the metal parts were dark brown and with the sacking somehow impregnated into the metal. All total write offs. I had a look to see if anything could be salvaged but all were totally ruined. Lagopus.....