Time domain reflectometry would find you in no time.
Furthermore, the power supply doesn't need to have high current capacity. 1A is plenty enough for the intended purpose and this works out to 2kW - good for one electric kettle.
Furthermore, the power supply doesn't need to have high current capacity. 1A is plenty enough for the intended purpose and this works out to 2kW - good for one electric kettle.
If anyone tried doing this today in a similar environment and succeeded, I think there would be be plenty of people trying to tap electricity from it.