Sink or Swim

First up, you're on the upper level of the boat. Take out the enemies up here quickly. Keep an eye out for an armored guy – if you've got the grenade launcher or just regular grenades, now's the time to use them. After him, a riot shield enemy will show up. The trick here is to run up, melee them to get their attention, and then immediately dive behind the wooden crates on the opposite side. This will protect you from the snipers who pop up behind you.

More enemies will drop down from where the snipers were, including another armored unit. The whole boat is starting to capsize, so we need to find an exit. Look for the red light marking the way out.

As you head for the exit and reach the stairs, Drake's going to fall and bust open a bulkhead door. You'll find yourself trapped underwater. Quickly tap the [Triangle] button to swim out before you drown.

You're back underwater, but don't panic. Look for a vent with light bubbles coming from it – that's our way out. Swim towards it.

Next, you'll need to sprint through a hallway. Watch out for a gap in the floor – don't fall in! Use the red wire to climb up, and then shimmy to the left. Use the doors to get back to the bar area you were in earlier.

Since the ship is now sideways, Drake can't just walk into the next room. You'll need to use the bar as a stepping stool to reach the hanging door.

Once you're in the next room, make a quick detour into the bathroom on the left. You'll find the Silver Rococo Napkin Ring treasure in there. Grab it, then climb up the bookcase and exit through the door.

Now, climb up to the deck. You'll get a great view as you run along the starboard side of the ship towards the ballroom.

Head to the elevator and get inside. Of course, nothing goes smoothly. Drake will end up hanging from a chandelier that's now crashed through the glass roof of the ship.

Carefully make your way down the side of the chandelier, then jump to the red wire in the middle. From there, swing to the section of the ship that fell.

You're finally on the floor. Head for the exit for a cutscene, and then it's a mad dash to escape the sinking ship and complete the chapter!