The Three Great Generals of the Northern Continent respectively guarded the three frontier defense lines in the northwest, due north, and northeast.
Although the Umbrella Defense Line shielded them, the fortress's Great Wall still had to remain on alert year-round. Aside from Source Matter Storms, the vast Old World might also bring unknown transcendent creatures.
They had not appeared before.
That did not mean they would not appear in the future.
Thus, every major frontier city was equipped with the highest level of surveillance equipment. In the past, the Investigation Corps was responsible for dispatching Garrison Commanders to conduct regular patrols and ensure that nothing abnormal lurked beyond the Umbrella Defense Line.
Now that there was the Deep Sea, surveillance could be left to artificial intelligence.
The Northern Continent had deployed vast numbers of "Electronic Eyes" beyond its borders.
Because the Old World's source matter was chaotic and its environment harsh, the "Electronic Eyes" were damaged frequently... But that did not matter. Their production cost was not high. Every year, Central City allocated sufficient funds to ensure the frontier's "vision" remained broad and clear. As the Deep Sea Main System continued upgrading, the number of compatible Electronic Eyes kept increasing, greatly easing the burden of monitoring beyond the frontier.
The frontier had once trained large numbers of transcendent sentries, who had to risk their lives exploring the Old World and assessing the danger.
Now, those people had been assigned to posts where they were needed more.
As for surveillance work, it had become an indoor task.
The Deep Sea transmitted the Old World's visuals into the main city through the Mental Network. As long as a Mental Affinity transcendent of at least the second tier established a connection, the images and information could be steadily received and processed.
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