10 Kg GOLD JEWELRY IN A PLASTIC BAG

[elhit29]

HI,,

IF WE HAVE 10 Kg GOLD JEWELRY IN A PLASTIC BAG BURIED 20 YEARS AGO 50cm UNDERGROUND IN AN AREA 25m x 25m ... KNOWING THAT THE PLASTIC IS 100% SIGNAL INSULATOR AND THEREFORE ALL ELECTRONIC AND SCIENTIFIC DOWSING MACHINES WILL FAIL IN THIS SEARCH... WHAT OPTIONS DO I HAVE SO AS TO FIND SUCH BAG WITHIN SUCH AREA???

THANKS