How do you keep the zombies out of the ventilator shafts?
While I suspect that you are making fun of me - I will give you the respect of an honest answer and not rise to your bait.
Powering the massive motors required to move an adequate CFM through the scrubbers and into my compound was a major issue, even with my perfection of cold fusion. The cost of the copper lines to transmit the power was prohibitive. After laying out nearly $8000 for my John Deere 770 with back-hoe (used to dig out the main shaft) I just didn't have the spare funds.
You may be reasonably thinking, "He can afford to perfect cold fusion but can't afford wiring?", I should explain that cold fusion was surprisingly inexpensive to achieve and harness. All it takes is 2 coca-cola bottles (but they must come from the Bangor Maine bottle plant from the 1920s), some purified water, three aspirin, a piece of hemp twine, an earth magnet, and some duct tape.
Anyway - since I couldn't purchase enough copper-wire, I needed to come up with an alternative. After a few months I was able to make Tesla's approach workable enough to transmit the power wirelessly. Thank god - otherwise the whole project was gonna have to be scrapped!
I hope that answers your question.