Only One Way Out is the tenth chapter of Uncharted 2: Among Thieves.
After finding out where the entrance to Shambhala was, Chloe and Nate overheard the chatter of soldiers, who apparently found their way into the temple. There was only one way out and that was the way they came in.
Nate then realized that they must have ambushed Jeff and Elena on their way in. Therefore, the two hurried their way back to the entrance, fighting through waves of soldiers. Upon reaching the entrance, they found it blown open, and Jeff and Elena were nowhere in sight. However, when they ran outside, they spotted them up ahead being attacked by the soldiers and Nate told them to stay down while he and Chloe took them out from their posts.
As the chapter begins climb out of the room the way you entered, through the statue's mouth, and back out to the light chamber where some of Lazarevic's men wait. Take them out rather easily by getting in close and using your melee attack. Grab the sniper rifle off of one of them before proceeding to the next area.
Head towards the temple's exit, taking out as many enemies as you can with the sniper rifle right off the bat. Chloe provides support while you do most of the shooting. Look out for the heavily armored, shotgun-wielding enemies as they deal a lot of damage and take a lot of hits before they go down.
Grab a riot shield from a fallen enemy and use it to reduce your damage intake while you make a run for the temple exit. Keep heading toward the outside as enemies attack.
Once outside the temple you face a fleet of Lazarevic's troops in the pouring rain. There's no need to venture out into the open so just be patient and pick them off one by one from the safety of the masonry right outside the temple's doors.
Once you've cleared out the enemies from the temple courtyard grab any ammo you need and make your way to the other side where you'll find Elena and her cameraman to end the chapter.