Dude those 2 quotes prove each other wrong first u said that the people in the space station thought they were looking at the Earth and mistaking it for he moon then you changed your mind and decided that they were looking at the moon and they saw themselves leaving the Earth.
They thought that the "upper" planet is the moon.The one they saw from Earth.


Also in the pic below you have your "walls" marked off as the white lines but it isnt right. The bottom of the hexagon should be flat with the world map but as you can see it is has actually been rotated slightly so that the bottom of the map and bottom of the hexagon do not match up.
I don´t know if I understood you but there is no problem to have a white line passing these rough mountains.After all it seems one can´t cross them on foot.

The waves somehow time travel when they reach the boundaries.
The cables were created in a way that they seem to link with each other but they not.
Maybe there were transmiters at the extremity of a cable on one era which emit to a receiver on the extremity of another cable on another era.But since they were underground people other than Hyne don´t know it.
Maybe shumis possessed by Hyne created them.