This is the 16th mission of the story and you start right off the cave you escorted Oliver after saving him. After exiting the cave and you'll receive intel from Willis claiming that a man named Buck knows where Keith is. Fast travel at Badtown to meet him. Once in Badtown go to the marked location, it's the bar Enter the bar, and approach the man indicated by the objective icon. This will start a cutscene where Jason and Buck talk about Keith and the knife... After that leave the bar, and head over toward a boat named the Nostalgia just located east of Badtown. If you have liberated Tequila Sunrise outpost fast travel there. Get the quad bike outside and drive to the shore in order to get a jet ski. Once there take it and drive to the Nostalgia. Approach the boat with caution, and if possible, abandon the jet ski you're using to reach it before you are spotted by the patrol on the boat. Climb up the ladder, and eliminate the pirates with your style. After eliminating all of the pirates go to the marked spot, it's a door enter and be ready to takedown a pirate after the loading screen. Go to the next room, then be careful of the two pirates located in the room after that. Try to kill them silently in order to disable the alarm (i failed doing that also because of the constant cat harassment). Continue on through the ship until you reach the room with the flashing red lights. You will find three pirates in this room. Eliminate them, and the door at the front of the room will open to reveal a Heavy gunner. Kill him and proceed to the next room with the laptop and interact with it. This will start a cutscene and everything goes boom. After the cutscene ends, you'll have to escape the boat before you drown. Make a left at the first turn, then continue to make your way through the sinking ship. At some point you will find a hatch you must open, open it, and prepare for an interactive cutscene in which you must prevent an enemy from killing you. After hitting the right buttons and killing him enter the next room and breath a bit of air in by interacting with the air container floating around in the water. Quickly navigate through the next couple rooms and use the available air containers to survive.When you reach a window break it and get out ! A final cutscene start and you will end up on a beach with the lovely Buck. He asks if you found the compass, and tells you that the compass will lead you to the ancient knife... The mission ends here..
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