It is a station in the core of a planet, with lava around and as it is a station, it has the same style of engine but I tried to make it more different with lights and static meshes then.
There are also catwalks and several teleporters included, (if you see a small room somwhere, be sure it is a teleporter), also I build some windows sothat players can see the lava.
Also I added a sound which fits very well to the theme of the map in my opinion.
As a small suggestion, at first watch the screen in the first spoiler sothat you get an overview over the map, otherwise it can be hard to understand where the screen was taken. Additionaly you could watch the video, or just download the map in the link at the end of the post.
Explanation of the first screen:
You can see 4 cubes here on the screen (made from the editor).
View from the top without 3D ---- Red boxes = Vent; blue boxes=rooms
View from the top with 3D ---- View from the top with 3D and lights
http://www.xfire.com/video/31bee1/
Last but not least the downloadlink:
http://rapidshare.com/files/410259221/T ... n.ctm.html
Please post some feedback!