"This is a Harvester, and we also have the Aerostats which are a kind of medium-size Terminator. Again, we've gone for as much of a sense of realism in this really dark world as we can. Cameron said to me with Battle Angel that the important thing is that the designs always are able to do the jobs they're designed for and it's the same with this movie. The Aerostat's job is to go out and they search for humans, they fly over the landscape, and when they spot humans they send out for one of the Harvesters who come in, very much like a big storm-trooping soldier, and load the living humans into the Transporters."