Assassin’s Creed IV: Black Flag The Blue Hole is another secondary location that requires the diving bell.
The collectibles in The Blue Hole area are scattered around a large shipwreck surrounded by sharks and eels.
There are three AC4 Animus Fragments and ten underwater chests in the Blue Hole, all of them revealed by the following guide.
Assassin’s Creed IV: Black Flag The Blue Hole Collectibles Guide
Total number of collectibles: 10
Animus Fragments: 3
Other activities: N/A
Assassin’s Creed IV: Black Flag The Blue Hole Animus Fragments Locations
Animus Fragment 1
For the first Animus Fragment in The Blue Hole, you will have to swim towards the bottom of the ocean.
The collectible is inside a smaller section of the same shipwreck, but it is separated from the main ship.
Animus Fragment 2
The second fragment is probably the trickiest in the area, because even if you see it through the wreck’s walls, you will have to swim all the way to the bottom of the ocean.
While standing close to the ship’s hull, go around it, and close to the ground look for a crack in the wall. Explore the chambers to retrieve the fragment.
Animus Fragment 3
The last Animus Fragment is outside the ship, located on a rock. Swim towards the bottom of the ocean to find it.
Assassin’s Creed IV: Black Flag The Blue Hole Chests Locations
The first chest marked on the map is inside the large shipwreck, under the main deck and under the stairs. Inside the chest you will find 321 Reales.
The second chest is easier to find, being located on the bottom of the ocean, under a smaller section of the main shipwreck. Inside the chest are 316 Reales.
After you get the previous chest, you can get the third, which is located inside the large shipwreck.
To get it you will have to reach the area where the ship was split in two. Inside it you will find 264 Reales.
The fourth chest is in an accessible area. Swim above the main deck of the second section (rear side of the wreck) and look for it under the captain’s bridge. The chest contains 1000 Reales.
The fifth chest is very close to the second fragment that can be collected by accessing the ship’s rear end. The chest contains 304 R.
Chest 6 & 7
The last two chests are fairly easy to collect, because they are located away from the main shipwreck. The sixth chest contains 330 Reales and it can be found under a smaller section of the ship. The location is protected by an eel. For the last chest, you will have to swim north and stay close to the ground, to avoid the sharks above. The chest is also on the ground and inside it you will find the upgrade plan for the Elite Broadside Cannons.