I've never heard of one this big, but I would think inside for sure. Something else you can do is ask with your dowsing rods. Pose the question "Should I treat this Negative energy Vortex inside?" "Do I need to treat this negative vortex outside?" "Should I treat this Negative Energy Vortex inside and outside?" I have confidence that you will be led to the correct answer. The rods have helped me in many different ways. The other day I found a small object that had been missing for at least two years, the rods led me right to it.
