The underwater areas are fairly simple, making getting around easy. The downside to this is that there is little cover to hide behind. The large amount of water in this map requires that you be accurate with your shots, with the glock seeing the majority of the action underwater. The texturing and lighting were well done. All the areas are unique but they fit in with the overall scheme.
Lighting is smooth, with some natural light coming in through the open ceilings.
All the weapons except for the egon are here. The RPG is in a room that can only be reached by a teleporter. The teleporter is behind a button operated door, which sounds an alarm when opened. The RPG is not very effective here due to the twisting layout and its slow movement underwater. The gauss gun is in a cage underwater.