Hmm. This one is a head-scratcher. We know that the sound barrier changes based on the medium the sound is propagating in. in air, it is 717 mph, but in Alumin

Hmm. This one is a head-scratcher. We know that the sound barrier changes based on the medium the sound is propagating in. in air, it is 717 mph, but in Aluminum it is 3100 mph. So, there is a chance that if you could create a zone of a different medium for light to travel through, (as to what that could be, I am not sure, probably something like a naked singularity or some field symmetry that changes the background "electromagnetic vacuum", whatever) then you could approach the speed of light and be traveling faster than the observed speed of light in a vacuum.