I can't see a use for it for people. But maybe putting fusion cores into it and having it launch them out like a cannon.. ad a little randomness to a map.
hmm... what are we talking about? you didn't post any pictures or really describe much so i'm a little lost there. all you said is yu have mancannons in the tube and that isn't really a map idea, its more of a feature
From what I gather, he's put man cannons on the side of the tunnel between the main Sandbox level and the Crypt.
Sorry for the lack of pictures, it will shoot you from the crypt via mancannons inside the tunnel to the top of the map, then through a set of twisting tubes to the top of the map
I've made the tunnel if you'd like to check it out, but just wondering peoples ideas for the flythrough