Quietubes

Quietubes are a (sometimes) quite dangerous way to get to different parts of the sky faster. The most dangerous is Amnetost to Ultria, as the voyage is really fast and often tears ships apart due to ice crystals slicing the hulls on the way there. The passages are called quietubes because they are in the shape of cylinders and are completely quiet as you pass through them. The abundance of entrances and exits of these is what caused Stoarem to be the most dangerous place to be, because of it's connections of 5 Quietubes and a Jet Stream that passes by to the north.