TheRainmaker
The Fast recon scans point that the signal seems that the faint signal seems to come from atop a massive tower that stands three kilometers tall from the base of the mountain that it is positioned it. Due to the distance, the scans don't turn the insides in detail but they do point a series of tunnels that spread like an ant's nest beneath the ground, all interconnected with stairs and elevators, multiple collapsed and closed doors.
Approaching the tower, some massive cannons are seem slowly swirving to take aim at the flying objects, that are both too small and fast to be shot down by them. Likewise, the cannons seem sturdy enough to not be defeated by whatever threat is too fast to be shot down by, at least from the outside.
The tower stands atop a lonely mountain amidst multiple fissures on the ground of the planet, and the dimly illuminated green skies. A single metallic pad is seen in front of a rather obvious entrance, there seems to be a single ship landed on it. The pad is located in a place where the cannons cannot shoot, so it is the best option to land.