This page of the guide has a walkthrough for chapter 4 of Uncharted 2: Among Thieves called Dig Site. Drake continues to explore the jungle from the previous chapter. However, Nathan will also explore a ruined temple. Nathan will participate in more battles with hostile mercenaries. You can kill them faster using, e.g. grenades.
The fourth chapter isn't the longest, and its main part will be the fight near Lazarevic's tent. There are many enemies here, however, Nathan will get access to grenades.
You will also have the opportunity to explore a little to find three hidden treasures.
Difficulty level: low
Number of opponents: small
Chapter type: combat
When the chapter begins, walk on the stones. Go around the large tree, head to the small waterfall and jump down.
After a short cut-scene, you will reach the camp. Drake will hide behind boxes. Wait there for one of the opponents to get closer and finish him. You can run into the camp - there aren't many opponents - or you can move quietly through the bushes (visible on the right picture, on the left).
You won't encounter many opponents so no need to be cautious. Kill the remaining enemies and enter the tent to trigger another cut-scene.
After that, the enemies will launch a massive attack. This fight is more difficult meaning that Drake can die easier. Drake will automatically hide behind one of the windows, near the supply of grenades. This starting position is great - don't leave it. Use grenades (their mechanics are much better than the ones from the previous game) as often as possible. Enemies will stand close to each other meaning that you can kill a few of them with a single explosion. A generator is on a wooden bridge nearby - blow it up when enemies are approaching it.
The fight is long so do everything you can to avoid getting attacked from the left flank - they will try to attack you from that direction at all cost.
At some point, your partner will ask you for help - he will be attacked by a large group of opponents. This is the moment when you have to leave the cover, but only for a moment. Run in the direction in which you got to the base, and eliminate the enemies on the stone shelf.
Then quickly return to the place where you started - the enemies will continue to attack. At some point, Sullivan will warn you about enemies approaching from your right. Leave the position from under the window and go in that direction to finish them yourself.
The battle will end when the enemies will start a massive attack near the neighboring red tower. Get closer to them but remember to hide behind a cover - throw a grenade in their direction. The explosion will open a further path - the battle is over [secret 1]. Then walk on the destroyed structure...
...to join your partner. Turn left and follow the long path full of turns - you will also climb a little.
You will reach a place where you can admire a beautiful view. Move a few steps forward to trigger a cut-scene - Drake will reach a ruined temple.
Go inside and jump to the lower floor [secret 2]. You reach a large room that leads to the next two. At the entrance to one of them, you will be attacked by bats - go there and set the resin on fire (to the left of the entrance).
Follow the traces of blood on the ground. To make this task easier, go to the third room and push the debris.
You reach the last and largest room. Go to its opposite end [secret 3] and watch a cut-scene. This way you will get an artifact that is key to the plot. Head to the exit.
A column with protruding elements is in the place where you have jump down to the lower floor - climb these elements to reach the top.
Watch another cut-scene and be ready to run along the cliff. You have to keep running forward. If you run into an opponent, knock him out with your fists. At some point, you will have to jump towards the stone shelf located further. Unfortunately, the rocks under Nathan will subside. The hero will fall into the abyss, grabbing protruding stones. Climb them and continue running. After a few meters, this part will end.