After 300+ downloads of my tunnel maps, I've decided to make a version 3 while taking into consideration all the commenters from this site. I completely remade this map from the ground up to include two tunnels that go from wall to wall, so in essence it is even longer than before. The tunnels are placed on top of each other and there are side passages that go to a middle area, connecting the lower tunnel to the upper. The bases are identical, so there is no advantage or disadvantage in either one. This version of the map utilizes more advanced forging techniques than the previous versions. I had used respawn areas as a "laser level" of sorts to make the tunnel perfectly straight and to alight the red base features to match the blue base. The respawn points have been fixed so there is no spawning outside the map. Each base contains a mongoose, now more tactical since they can travel in the lower tunnel, possibly flaking the flag carrier before he reaches his base. There are also two shied doors at the bottom of each side passage to the middle to add cover for players storming one base. This map is completely within the budget of Foundry and is set up for flag, hill, assault, and oddball.

In each base there are:

Two battle rifles at the entrance plus one on the wall edge of the side passage.
One shotgun located in the back of the base (180 sec)
One bubble shield located by the window (90 sec)
And one mongoose (150 sec)

In the middle underneath is a sniper rifle with two spare clips (180 sec) and above are two plasma grenades (30 sec)

After countless testing of weapon placement I have found this setup to be fair. I have found that the sniper rifle acts as a power weapon on this map enough to replace the rockets and laser. I had placed the sniper rifle in a vulnerable spot in the middle instead of in each base to make for better gameplay. Shotguns are placed in each base to add to the defense of the flag and bubble shields for cover from offending sniper fire.

Download Here

I made a game variant of Multi-Flag that should play very well for 4 to 6 players. It includes BR start, flag home to score, and 10 sec team respawn.
Download Game Variant

Enjoy!

<< Update 1/25/09 >>
I made some minor tweaks to the geometry and weapon layout for better gameplay.
You can download the latest tunnel here:
Tunnel v3.6 aka SLAC Tunnel