Dark Hole

Xia Fan and Nie Yan's secret communication method could be considered simple and crude.

He left Hidden Mountain Outpost all by himself, then accelerated. About ten minutes later, Xia Fan arrived at a barren mountain three hundred kilometers away from the city. Standing there in the middle of the wilderness, Xia Fan calmly accessed his stealthed spatial ring, and retrieved a Star-region-grade long-range walkie-talkie.

The walkie-talkie that could communicate across an entire star region was quite sizable, as heavy and bulky as a solid brick.

Because the Outer Frontier lacked any interplanetary system communication network, they needed to rely on something like this to establish a connection with their headquarters. There was no way around it, given how the Outer Frontier was still nowhere as developed as the three Federations.