I do love doing the deep old warrens though, regardless of the return, especially when you have confidence in your ferrets and your in no rush with regards to time or numbers. The other day a friend and i netted up 40+ holes, not huge, but big enough, with a good depth. There was only one rabbit (it transpired) and we entered 3 jills. Round and round they went but they finally get her out. I love hearing the run around beneath you and imagining your ferrets really grafting and hunting, the fact thats its tough and the ferrets have to work for it makes it even sweeter when the rabbit pops out.