Greyfrog Design, that looks cool. The cave architecture is quite nice. Some of those screenshots look a little bland though. Perhaps you could add a bit more depth and character to the level such as some signs/billabords/posters etc, perhaps you could use a spotlight or two in the map to create dramatic shadows (rather then the fairly evenly lit level you have), have some pipes or wires dangling around, ability planks of wood, crates, drums etc.
Make sure you have some sweet non playable spaces that the player can see but not get to to create curiosity and make the player feel like he is in a small part of a larger world (rather than feeling boxed inside a Counter-Strike source map).