The Age of Civilization.
Four thousand kilometers might not have been an especially staggering distance. Even an ordinary person could drive the entire way in a few days.
But this was the Wasteland.
The straight-line distance from Tian Yuan Territory to Giant Tree Root Sea Area was a full 3,200 kilometers.
Taking into account the detours caused by the terrain, that figure would increase by at least another thousand kilometers.
If they relied solely on walking every day, it would take at least two months, and possibly even longer if unexpected incidents occurred along the way.
Even with Off-Road Energy Vehicles, it would take at least half a month, approaching a full month, to arrive.
That was also why Bao Lei had repeatedly requested assistance, yet the territory simply could not send anyone to help.
The distance between the two sides was far too great—so great that they had no way to control whatever accidents might occur in between! However, the Jiu Zhou Great Rift Valley Base was different.
According to the people who had escaped and the research institute guards who had been captured,
starting from Tian Yuan Territory, they only needed to cross an easily traversable plain and then pass three or five small mountains to reach the Great Rift Valley Base in the center of the hills.
The straight-line distance between the two sides was roughly 800 kilometers. Even with detours, it would not exceed a thousand.
More importantly, the airship still had a route map they had explored, eliminating eighty percent of the trouble.
Even after considering every possible accident, Su Mo had to admit it.
That research institute truly lay within the range the territory could currently reach.
If not for the arrival of the Metal Sigh Disaster, traveling there by energy vehicle would take