I have seen tunnels, wormholes with all possible worlds and people's heads through little portals along the walls. And you could make new tunnels just by exploring. I have seen into other people's worlds but kept exploring and creating tunnels. The matrix all these tunnels were in was kind of a matrix of unexplored consciousness in the form of colored protomatter. It is hard to explain. Kind of like a termite eating tunnels through wood but the wood is 5th dimensional light?
The thing I remember was this: that the more you explore the more you forget who you really are as you get lost in descending levels of identification with form. By turning around and retracing your steps through the maze you created that lead to this incarnation and where you are now you come to the beginning of your first descent into this maze, when it was just a curious whim (I wonder what that is like down there?). And then you remember the whole thing.
Probably not the same thing you are describing, but it reminded me of it. So were these pipes like plumbing or were they a vehicle? I think that you mean that you got shot through a pipe, right?
I would love to explore these pipes connecting our heads.