They did not know about "Soul" or "Divine Skills" transforming into Spirit Essence, not even the concept of "Spirit Essence" had formed yet.
12 Noob Civilizations, mutual contacts among complete beginners, they had even formed confidence.
In a situation where civilizational conflicts had never erupted, indeed, they would tend to cooperate and exchange...
They even deeply believed that their set of procedures was quite reasonable.
Of course, the Dark Steel Civilization also kept a precaution, this time the meeting location "Shitong Fortress" was outside the Grotto Heaven, a large defensive building constructed within a mountain peak.
Even if the other party really had ill intentions, as long as the location of "Grotto Heaven" wasn't exposed, the risks remained controllable.
...
Thus, human drones, following the insect-shaped aircraft of the Underground Alliance, flew a distance of about 25 kilometers.