This map reminds me of the battlefield 3 map Metro set in paris. I am very much a fan of underground maps in general since its not an area of map design i see creators or game companies take advantage of. I love the vents you added in around bombsite A, but i feel another vent can be added to bombsite B, where CTs can make a quick and daring drop from the tunnel above and land on the heads of unsuspecting terrorists, but thats me.

One thing on this map im quite concerned about is the severe lack of chickens. Where did they all go? We all know the london underground is nothing but a chicken farm, with the noise and everything. This unrealistic approach is something that needs to be addressed at some point.

Im looking forward the see what changes you make in the future and other peoples responses to this map!