> That's the point of hollow-core fibre

Ok, how does that work though? I understand the concept of lower attenuation since air/vacuum has less molecules to get in the way. Less repeaters, should have less system latency.

What I don't understand is how light is moving through what is a hollow bendable medium. Is the tube that it's in reflective and there's just less time it's passing through it? I guess that's the main one in commercial use to shave some time off, reading about it here: https://en.wikipedia.org/wiki/Photonic-crystal_fiber

It works in that light will travel faster in a less dense medium. Remove the relatively denser glass for gas/vacuum.

Also the way fibre works is commonly misunderstood. The light isn't bouncing.