Assassin's Creed Black Flag Resynced launched today, and players are already hunting down every secret the Caribbean has to offer. Among the most rewarding activities in the game are the 7 Diving Bells scattered across the map, each one hiding a collection of standard chests packed with Reales and one secret chest containing something considerably more valuable.
Here's the lowdown: those secret chests are where the real prizes live. We're talking Ultimate Plans for ship upgrades like the Mortars, Swivel Guns, Broadside Cannons, and Ram, plus a rare weapon in the form of the Espada Ancha cutlass. If you're serious about upgrading the Jackdaw and keeping Edward competitive, these locations are worth prioritizing.
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What the secret chests actually contain
Each Diving Bell follows the same structure: several standard chests loaded with 1,000 Reales each or bundles of jewelry and trinkets worth a few hundred Reales apiece, then one secret chest that holds something unique. The secret chest rewards break down like this:
The Kabah Ruins in the Navassa region is the most chest-dense location in the game, with 11 standard chests plus the secret one. Devil's Eye Cavern and The Blue Hole both pack 10 standard chests, making them the next most lucrative stops for raw Reales farming.
Why these rewards matter for ship progression
The Ultimate Plans found in Diving Bell secret chests are tied directly to the Jackdaw's most powerful upgrade tiers. Ubisoft rebuilt naval combat for Resynced with new alternate fire modes and more demanding enemy ships, which means having those upgrade blueprints early gives a real edge. The Mortars Ultimate Plan from the Antocha Wreck and the Broadside Cannons Number Ultimate Plan from The Blue Hole are particularly worth chasing if you want to tackle the tougher naval encounters without grinding for resources.
The Espada Ancha from The Black Trench stands apart from the rest. It's a rare cutlass, not a ship upgrade, which makes The Black Trench the go-to stop for players focused on Edward's melee build rather than Jackdaw firepower.
Chest counts by location at a glance
For players working through completionist runs, here's how the chest counts stack up across all seven locations:
- Kabah Ruins: 11 standard + 1 secret
- Devil's Eye Cavern: 10 standard + 1 secret
- The Blue Hole: 10 standard + 1 secret
- La Concepción Wreck: 9 standard + 1 secret
- Antocha Wreck: 7 standard + 1 secret (note: chest 6 counts as the sixth numbered chest)
- The Black Trench: 7 standard + 1 secret
- San Ignacio Wreck: 5 standard + 1 secret
The key here is that standard chests in jewelry-heavy locations like Devil's Eye Cavern and The Blue Hole can yield significantly more than 1,000 Reales per chest when you factor in the stacked trinket bundles. A single chest in Devil's Eye Cavern can hold three items worth over 1,000 Reales combined.
If you want the full picture on how long clearing all of this takes alongside the main story, the how long to beat Assassin's Creed Black Flag Resynced guide breaks down completionist run times in detail. For everything else the game throws at you, the full Assassin's Creed Black Flag Resynced guide collection has you covered as more content gets mapped out.
