Interesting layout, very complex and narrow, though. Not sure about the pickups, there is one spot where you can pick up 2x grenade ammo. Are you sure you want a player spamming 20 grenades in a row ? ;)

Nice detailing in some parts, and good use of particles too, i love the place where the steam is "flowing" downwards, down at the water, near the center, for example. Nice texturing in parts too, you made some interesting texture combinations. I also like especially the broken parts ;)

About the lighting: It is very dark, and almost everywhere you used the same light colour, which makes it hard to orientate. Good job with the small blue lights though, adds a sort of variety to the texturing and overall look.

3/5. Good job, keep it up ! ;)