# Several gold coins has been digged up in Greece. They were situated in about 2 m depth under the ground.
# An accumulation of gold coins was detected with the treasure detector eXp 5000 in 3,20 m depth in rocky soil.
# The sensational discovery of a chest with gold bars was detected with the OKM earth imager eXp 3000 in aprox. 4,50 m depth.
# The engine of a fighter plane was located by Future I-160 in about 5 m depth under concrete soil.
# A gallery could be located by the metal detector eXp 5000 in 8 m depth. The diameter of this detected tunnel is 1,50 m.
# During official tests this historical tunnel has been located in a depth of 6 m under pavement. The tunnel has a diameter of 1 m.
# This old historic wine cellar has been dug up in France. This chamber is situated at 21 m depth.
Pictures were not attached but look at the link to complete the picture:
http://www.okmmetaldetectors.com/company/depth_penetration.php?lang=enThis has been a fact beyond reasonable doubt: