One obvious possibility is that they are intended to be used for the transport of the so-called elites to their new Zealand bolt holes, when / if a deliberate disaster is inflicted on the World.

Watch them like a hawk, and any locals so minded should stand guard over them, intercept any fleeing rats, and dispose of them with certainty.

If the shit hits the fan, there will be no rule of law and killing rats will be considered a public service.