Many moons ago I buried all my mom's jewelry in the garden, sealed in a large tin. I stashed my hoard under a foot or so of soft black soil and forgot about it for a while.
"Where's my jewelry??!!"
Oooo err, "Roughly............????????" It was a big garden. "I know, I'll get the mine-detector."
It had worked when it arrived from a military surplus shop, but now was as dead as a Dodo. It came in a full sized rucksack and had valves and needed very expensive batteries. The detector was a screw together thing that had two different heads. The whole shebang was bigger than I was. We went to the radio shop for batteries.
"How much??!!" My mom looked shocked, and hauled me out of the shop. "My jewelry's not worth that much."
Funny thing is, that it must still be there.....somewhere.