I have never dug to a ferret in 30 yrs.And,the fact remains,that if you dig a bury thyen itis a certainty that you will be digging it again,as you make more dead ends each time you dig.By the way,I have never lost a ferret either.If I have to leave a ferret in the bury I always leave a box with a hole in one end(with some straw and some milk and food in it)pushed in to one of the holes,and,so far they have always been asleep in the box in the morning.Maybe I'm just lucky,but,the amount of accidents I have,I don't think so.Good luck MC.