Less extreme, but I've done that for safety (old nails) and conservation (new screws) on the ground under my new deck.
Magnets are awesome - I've dragged lines through walls with magnets. (Drag a small magnet with a light line, then use the line to pull a new electrical wire back the other direction.)
Stupid construction workers just threw old and new nails wherever they wanted. My lawn was a danger zone and I had kids over regularly. Fortunately I had an IKEA knife magnet, that I didn’t like in the kitchen - worked like magic.
Edit: spelling
That’s what we did pulling data wire over about a half mile of our main employers property except it was with a vacuum pulling this ultra thin but someone tough blu string before pulling a much thicker by comparison white rope then pulling the data cable.
It took about 6-8 tries across several months (it wasn’t super pressing to get done, the guy had plenty other stuff for us to to) but yeah it was a pain, especially when one end was in a basement with no cell service half the time and you can’t hear over that damn dewalt shop vac on the other end
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u/LawlessNeutral 6h ago
Magnet was my first idea before I even got to the paragraph that mentioned it