I posted this back in 2006 here from the PS2 Game Stealth Force - The War on Terror I did whilst at Atomic Planet Entertainment. I found these renders today I did at the time, these were just to test the tunnel sections and details and were not used quite like this in the final game.
Here are some grabs I found online from the same level from the actual game, it really was a bargain basement shoot em up, the A.I. on the enemies was all over the place, you could literally be looking at a bad guy and he wouldn't see you, and then you'd be miles away from one and they'd start shooting at you. Still I had fun building this level even if the game was crap.