Assassin's Creed 4: Black Flag Walkthrough Part 84 Shipwrecks & Caves: “Jiguey” & “Petite Caverne”
Kenway can enter this cave by anchoring just outside the site. Before you go in, head over to the right-hand bank of the beach. There you will find a message in a bottle, the secret of the area. The tunnel leads right into a large cavern. Go over to the right after the entry tunnel. Climb on up the scaffolding there to reach the walkway above. Deal with the Soldier patrolling up there carefully. Stealth swim over to the far side and then climb up and kill him. Now drop down to the walkway you climbed past. Head down it. Deal with the 2 Soldiers that come after you. Follow it with dropping down to the walkway at water level then looking toward the wall. There are breaks you can slip through. This is because underneath the upper walkway there is an Animus Fragment. Grab it and continue on to the South. Deal with the next pair of guards then find the ladder nearby the water you climbed out of. From there look to the left to find a chest. Jump down to the beach now.
Head down the beach to the small Smuggler Camp. Deal with the Soldier and the Brute there. After that loot the nearby chest. Continue on then to the East. Kill off the next 3 Smugglers. Now, before grabbing the nearby chests, go behind the wooden structure. Back there you will find the next Animus Fragment. Now grab the last 2 chests. You are not quite done with this location.
If you have the treasure map from Ile a Vache, it leads you here. Go to the coconut tree nearby the Smuggler Camp. There you will find a chest with 4,000 R inside it. Grab it and you are done with this location. Hop in the boat and get back to the ship.
The treasure map for this Cavern can be found on the Cayman Sound. Head into the massive cavern ahead of you. Favor the left-hand side. When you get to the cusp of the Restricted Zone, look ahead. You will see a Gunner watching the entrance. Eagle Vision helps a lot to locate and mark him. Move in toward him in a hurry. Once you are in range, then hit him with a Sleep Dart. If you do not have one, just keep running toward him and climb on up. Deal with the Gunner then head West toward the main camp. Collect the chests as you find them. In the camp you will find a group of 4 Smugglers practicing their shooting. If you have a full set of 4 pistols, then you can just shoot them all. If not, shoot who you can then just kill the rest in melee. This will attract the attention of the next part of the camp. Either wait it out or just move in and kill them as well. Clear them out then head for the lower area to the West.
Once in the lower area, deal with the next set of smugglers and collect any nearby chests. After you finish with them, look for the trench in the floor. Head to the Southern end of it and climb up it. Look around the ground here to find the buried treasure.
Now make your way over to the North and deal with the remaining Smugglers on the docks. There are only a few of them and a chest or two with some other goodies. Collect them all and you are done with this location.