Based on 2fort and a bit of Well. I may change out some of the 2fort parts depending on feedback etc.
There is an exit tunnel that can be opened from the enemy side only.
Changes from b2 to b3...
* Fixed door noise
* Added new entrance to Intel room
* More map optimization
* Added more health packs
Pros: I like it mostly.
Cons: The damn noise everytime you open/close the doors underground, you can hear it anywhere on the map, that needs to go.
The room downstairs that goes into the Intel room makes the Intel room access at the top seem pointless to me.
Improvements: Get rid of the battlements access in front of the base from the ground. Not good.
Pros: Awesome concept, and design! It takes the good features of 2fort and well and puts them together while removing some of the bad things about them!
Cons: There are a LOT of ways to get into the intel room.
There are 2 automated doors that don't appear to work correctly.
Water and middle area could be made to have more of a strategic significance.
Improvements: Add more health and ammo drops, I only noticed 2 places where there was any, respawn rooms and in the intel rooms.
Shield the spawn exit on the left side more, a sniper could just sit there and pick off anyone that comes out. Might also want to remove the ramp on the left side, it makes the base much to access able to the enemy and basically removes the necessity to ever use the lower level entrance. Also, you might want to open the windows in the middle area towers, it would make them better strategic firing points.
Notes: Excellent map and though it's a beta, still a great start. There are a few bugs (minor such as door functionality and map prop collisions) but none that should be too hard to fix.
If you happen to find yourself in need of any mapping help with this, I'd be happy to assist.