I had a call from a very frantic man who explained his very precious gold signet ring had disappeared down a drain whilst washing his car in a petrol station car wash .
we agreed to meet on site this morning, and the challenge to recover this ring was soon very evident, upon lifting up the very heavy metal grates we were met with a waste water tank about 4 ft long and a couple of foot wide , full of a very pungent 3-4 feet deep thick black sludge , my Manticore detector soon located several non ferris targets , getting the thick black sludge out with my heavy duty sand scoop was at times a two man job ,we dumped ten or so scoop fulls of this foul smelling sludge on to the surrounding concrete,until there were no further signals, I started detecting the removed sludge but as the concrete the sludge was now sitting on 
had steel reinforcing inside , this masked all signals from whatever was inside the huge pile of sludge, we eventually got around this by using the car wash power hose , after a few minutes the very precious signet ring emerged covered in black sludge , the relief on this couples face said it all
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