CoD: Black Ops ... Endless spawn? *SPOILER*?

Good day. I am playing Black Ops on Veteran difficulty on my first play through so I can get as many trophies out of the way as possible. I get up to the level where you destroy the rocket and and running though the tunnels afterward. Right now I have gone down the steps fought guys, turned right fought more and hit a checkpoint here.

I can pop the two guys in the hallway and then fight my way into the next room then I get into the next hallway and here is where I have the most problems. I keep littering the floor with enemies. I end up getting a Scoped AK47 from one of the enemies in the room back and use the ammo from the dead's guns to restock. I have blow through my entire clip from my gun and 2 full clips from the AK47 and the enemies still keep coming. I am not sure if this is by design or I am just stuck in an endless spawn because I am trying not to die and am not making it through the room enough to trip the wire to stop them from spawning.

I can get my entire team into the hallway and I found a nice spot in a doorway to a door that doesn't open to the left. When I try to move up anymore to the next set of boxes there is a door way to the right where there seems to be one enemy that is always standing in the door way to kill me from my 3 (or I just have impeccable luck to always move up when he is there).

I would really not want to downgrade the difficulty if possible because I honestly don't want to play through any more times than I have to. Does anyone know if there is a trip line to stop the enemies/ Or if someone has a good strategy that could get me through this hallway it would be helpful.