Buried them behind drywall and ceilings, not in dirt. Look up https://en.wikipedia.org/wiki/Knob-and-tube_wiring https://en.wikipedia.org/wiki/Knob-and-tube_wi

Buried them behind drywall and ceilings, not in dirt. Look up https://en.wikipedia.org/wiki/Knob-and-tube_wiring https://en.wikipedia.org/wiki/Knob-and-tube_wiring that is in some cases operational even after a century.