Without the knowledge of why they are on the planet or what they are now looking for, Soundwave does not know how to be helpful and so simply stays quiet as he follows from place to place.
Are they seeking out the Autobots? He’s aware that this timeline suffered the defeat at their servos. Perhaps they’re looking for where a new colony might be?
It goes against his personal wishes to allow Megatron to continue fighting the war on this place after it has already ended, but he has a duty to himself and his minicons – and to an extent, serving Starscream and making sure he’s alive long enough to end Shockwave when the time comes. He can’t do that if he’s caught out for refusing to play along.
Trying to match his recollection of his own planet with where they are on this one (and hoping that they are not too different), Soundwave manages to bring up several nearby spots that used to lead to the lower levels of the city.
Choosing one, he mentally passes the coordinates along.
[[There.]]
It is all that he dares say that way for now.
The entrance is close enough, a familiar descent into Cybertron’s underbelly. It could be dangerous enough before the war, but now that it had been left abandoned for so long, there was no telling what vermin had taken refuge in the darkness.
“Stay close, and listen for foreign movement,” he orders, mostly for Xander’s benefit. The only light comes from Megatron’s optics, his companion’s biolights, and a few cracks in the floor from which the faintest shine of fluorescent blue can be seen. Megatron removes the hood of his cloak, finding it unnecessary down here. Once they have gotten a good distance from the entrance, the warlord turns to his mate with a concerned glance.
What is wrong, he thinks, assuming that Soundwave is listening.

