Uncharted 3 Walkthrough Chapter 13 - Rough Seas

In the last chapter, Nate woke up abducted by pirates, tied to a chair inside some shipping container. When you managed to escape, you found yourself in a strange shipyard. You have no idea where you are. But what you do know is that the pirates have Sully, and you need to rescue him fast. You spotted the pirates heading towards a cruise ship where you believe Sully is in. You must make it to that ship.

Keep moving towards the boat. Go through some floating platforms, and behind some containers. It is starting to rain, looks like a storm is coming. So everything will be swinging a little.

Initially, Its better to kill the enemies using stealth if possible  as to not grab attention.

When you get to the boarding area, lower the drawbridge and board the boat. The pirates will shoot a rocket at you, so jump off the drawbridge fast. Swim and climb back up to the docks. There will be lots of enemies, now that you have gotten their attention. Defeat all of them.

A good strategy is to take cover inside rooms in boats and shoot from the windows.

Try to board the boat again. A big wave will come. You will find yourself under water. The ship is leaving. You cant let it leave you behind. Run and jump onto it. Pick up the Mag 5 and use it to shoot the pirate.

You are now on a small boat, its not the one you believe Sully is in. Defeat the pirates there. It looks like the boat is starting to flood. Another wave of pirates will jump onto this boat from a second ship nearby.  Kill them and jump onto that adjacent boat before the boat you were in bursts into flames.

There will be yet more pirates in this boat. Kill them. Another ship will start firing rockets and you , and your boat will start going on fire. But two can play that game. Grab a rocket launcher and return fire, blowing that other ship up and sinking it.

You are now near the big cruise ship where you think Sully is. Your boat is about to explode. Jump onto the cruise ship's ladder. You only got one shot at this.