After a fairly short but very high speed journey down the tube, it spits me out in what seems to be a central chamber. This must be some kind of nexus for the tube system. Looks like they're all deactivated aside from the one I just came in on.
As I approach the center of the room, a structure rises from the ground in front of me, sensing my presence. Seems like it has a control panel of some sort on it.
I'll bet these symbols correspond in some way to the activation of the tubes in this chamber.
After a bit of experimentation, it seems that I just have to choose tiles that when placed together match the symbols over the tubes. Easy enough.
That's one tube. Now that I have it all figured out, I activate all the tubes minus the ones on the roof. I can't even get to those anyway, and who knows what'd come out of them.
Looks like one of the tubes has something wrong with it. It keeps flashing on and off. There's some kind of control panel next to it, but it's deactivated. So that leaves me with two choices.
Do I go left or right? For all I know, one of them leads straight to certain death.