Pretty much, although in that case they would indeed be very lucky to not set it off. I guess it is more likely that they find it when they put down the soil th

Pretty much, although in that case they would indeed be very lucky to not set it off. I guess it is more likely that they find it when they put down the soil they just excavated. I would like to be educated about this, but I feel they should pretty much expect these things and check with a metal detector before excavating the next layer of ground.