Finn listened closely to the sounds coming from the vent. To him these sounds gave information. With it he got an idea about the architecture and layout of the vents

. He had done this with Reva lots of times. Reva would be making a small sound with which Finn could measure a rough distance Reva made. When Reva would make a turn, he would produce a different sound, telling Finn he turned. If Reva reached a dead end again. a different sound would be made telling Finn of the dead end. 

Finn listened closely and while doing this his full concentration was on Revas sound. He did notice Dimitry and others entered the room by smelling their scent, but he didn't listen to their words. In truth he ignored them altogether. Some of the scents were new to him, but he didn't care. He knew he was save here and that he will meet the whole team in due time. 

Reva ran along the vents. Making sure it's speed was constant, it had little else to do. As it ran it noticed some of the crew moving through the ship. Every once and awhile a small barred window was placed I in the vent,and this was Revas way of looking at the crew.