There had to of been at least 4 guys working on this, two on each team. Theres no way the enemy would allow those teleporters there without destroying them, lol.
Ive seen these before, really funny. Unfortunately almost all the glitches have been fixed since then. Granted, In cod4 you can stand infront of the door in some maps and your team cant come out, yet they keep spawning XD, sorta like this.