Think of the building trades jobs that project would provide.
Saw an article over on Cracked providing some reasons why Bruce Wayne's batcave was an impossibility. Most of these reasons had to do with the secrecy angle of it, which doesn't apply here, but there was some discussion of the climate control angle of it. Computers don't like water, and supposedly, it is not feasible to climate-control a subterranean complex such as this.
So this is rather exciting. A moment of truth.
What? No indoor shooting range? Oh, that's right, this is in Canada. So maybe a tennis court with a refrigerated floor that could double as an ice rink? Just trying to help...