Was on a Thames Sailing Barge once, and we put aground (on purpose) on a sandbank at the mouth of the Thames which was partially formed by barges from the Victorians and earlier eras dumping the city's trash in the channel. Went for a walk, the barge's dog, Joxer, went on a killing spree, the place was alive with rats. We were kicking over glass and porcelain pots and what-nots and all manner of detritus which, dug up and washed clean, would probably fetch a few quid in the antique/junk shops in the more affluent parts of town.
"Where there's muck, there's brass" (brass = money).
"Where there's muck, there's brass" (brass = money).