There are seven shipwrecks that can be explored around the Caribbean (well nine if you include the smuggler’s dens that also have underwater segments) and each of them contains a large number of treasure chests with one of them usually containing a design plan that can be used to unlock elite level upgrades for the Jackdaw.

View Full-size

The Diving Bell makes it possible to dive and explore shipwrecks. It can also be used like an air barrel to restore air when you need it,

As these areas can be quite large and there are a large number of treasure chests, it is entirely possible to come back multiple times to hunt down and collect every last chest and Animus Fragment in each. For your convenience, I have written walkthroughs that will take you through each shipwreck dive spot in a single sitting whilst collecting all of those collectibles with ease.

Finding and exploring all seven of the available shipwrecks is a requirement for a level three Abstergo Explorer challenge.