Assassin's Creed 4: Black Flag Walkthrough Part 53 Shipwrecks & Caves: “Devil's Eye Cavern”

This is one of the rare shark-free areas. Revel in it to get started. Head straight forward to the wreckage in front of you. There you will find, to the right, the first chest. Be careful of the urchins on the rotten masts and the jellyfish just in front of the entrance inside the first part of wreckage. Head to the Northwest after you collect the first chest to find the second. Dive down into the second part of the wreckage to grab the chest. After that go over to the nearby air barrel. Refill Kenway's breath then head into the cavern in front of you.

Head forward into the start of the cavern. There is a barrier with an Animus Fragment just beyond it. In front of it is a strong current. Head into this current. You now want to keep facing North and favor the left-hand side of this tunnel. Watch the minimap as you move through this area. You can grab the Animus Fragment by riding this current until you spot an Urchin covered Stalactite ahead of you. Use High Profile and swim over to the left to get into the side tunnel you can just see on the minimap. It takes some careful timing and could require a second dive to get.

Once outside of this cavern stop at the air barrel to refill Kenway's breath. Head directly for the debris ahead of you and swim underneath it. Try to approach it from the left opposed to right as there is a Moray Eel on the right. Press on to the North after you grab this chest. Stop at the air barrel then head over to the hatch and interact with it. Dive inside the hold to find the fourth chest. Be mindful of a the pair of jellyfish in there. Collect the chest then head into the cavern entrance just next to it.

Swim in the current to the cavern with the air pocket. Stop first to grab the chest sitting in the Southwest corner. After that go to the air pocket. Refill Edward's breath then dive again at the Western edge of the air pocket. Swim through the next section of cavern until you reach the part with the Animus Fragment. Go over to the left and dive down to find it. All the while here, be very mindful of the jellies. There are a great many of them for Edward to weave around. Press onto the South after that. There is another Air Pocket for you to use.

When you get to this air pocket, head to the Southern edge of it and run up the slope. There are 2 chests there for you to loot: grab them. One of them contains the Elite Swivel Guns Plans. Now head to the Western ledge and dive back into the water.

Once in the water go down straight West. You will find the final chests sitting there. Now head to the West. Edward will find high speed currents that will sweep him through this area. Avoid the stone columns that are in your way. When you make it to the far end, take a moment to visit the air pocket.