How to Swim to the Lowest Point on the Map in Assassin's Creed Black Flag Resynced

Q: Where is the lowest point on the map in AC Black Flag Resynced?

The lowest point is at The Black Trench in the Castillo de Jagua region, northwest of the map at coordinates 184, 425. You need to use the Diving Bell to enter, then dive to the very bottom of the trench and find the broken diving bell on the ocean floor.

Q: What do I need before I can reach the lowest point on the map?

You must complete the Diving for Medicines mission in Sequence 6 first. This unlocks the Diving Bell and marks all underwater shipwreck locations on your map. Without the Diving Bell, The Black Trench is too deep to access.

The lowest point on the map is at The Black Trench in the Castillo de Jagua region, northwest of the map.
Map coordinates are 184, 425 — look for the mast sticking out of the water.
You must complete Sequence 6 – Diving for Medicines first to unlock the Diving Bell.
After diving in, swim southwest past the sunken ships, top up oxygen at the air barrel, then dive straight down.
Find the broken diving bell on the ocean floor and swim close to it — hug the sea floor if needed.
This unlocks the Davy Jones’s Locker trophy or achievement.
The trigger can be finicky — if it does not pop, resurface, return to the Jackdaw, and try again.

How to Swim to the Lowest Point on the Map in Assassin’s Creed Black Flag Resynced is one of those tasks that sounds simple until you realise the ocean is huge and the game gives you almost no clues. This is tied directly to the Davy Jones’s Locker trophy and achievement, and it requires a very specific dive at a very specific location. If you have been wandering around jumping off the Jackdaw hoping to hit the floor somewhere, that is not going to work. Here is exactly where to go and what to do to get this done.

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What Is the Davy Jones’s Locker Trophy and Achievement

The Davy Jones’s Locker is one of 49 trophies and achievements in AC Black Flag Resynced. Its requirement is simple on paper — swim to the lowest point on the map. But the game never tells you where that is, which is why so many players end up stumped.

It is worth going for because it counts toward your overall completion progress. If you are pushing for the Platinum on PlayStation or the full 100% on Xbox and PC, this one is not something you can skip. The good news is that once you know the exact spot, the whole thing takes about five minutes.

What You Need Before You Can Do This

You cannot access the lowest point on the map early in the game. You must first complete Sequence 6 and the Diving for Medicines mission. This is the 22nd main quest in the story. Finishing it unlocks the Diving Bell, which is the only way to safely reach the deep underwater shipwreck locations across the Caribbean.

Without the Diving Bell, the underwater zones at The Black Trench are simply too deep to reach. Once it is unlocked, all seven underwater shipwreck locations get marked on your map automatically and you are free to visit them in any order.

If you want to keep on top of where you are in the story, check our full list of main and side missions in AC Black Flag Resynced. And if you want to know roughly how much time you have left, our how long to beat guide covers that.

Where Is the Lowest Point on the Map in AC Black Flag Resynced

The lowest point on the map is located at The Black Trench, an underwater shipwreck in the Castillo de Jagua region in the northwest corner of the map. The map coordinates are 184, 425. Sail to that position and you will spot a mast or ship structure poking out of the surface, which is how all underwater shipwreck locations are marked.

This is the only diving location in the game where the secret chest does not drop a ship upgrade plan. Instead it drops the Espada Ancha, a rare cutlass for Edward’s melee loadout. So even outside of the trophy, this dive is worth doing for the loot alone.

How to Reach the Lowest Point Step by Step

the black trench location ac black flag resynced

Step 1 — Sail to The Black Trench

Open your map and navigate to coordinates 184, 425 in the Castillo de Jagua region, northwest of the main map. Sail the Jackdaw there and look for the underwater shipwreck marker. Park nearby.

If sailing around takes time, our fast travel guide for AC Black Flag Resynced can help you cut down the sailing time once you have locations unlocked.

Step 2 — Use the Diving Bell to Enter

Interact with the mast or shipwreck marker to deploy the Diving Bell and drop into the water. Once you take control of Edward underwater, orient yourself southwest and swim toward the large sunken ships ahead of you.

You will know you are heading the right way when you start seeing jellyfish swimming around the wreck and a large rock face appears on your left side. Use these as your visual guides.

Watch Out for the Shark ac black flag resynced

Step 3 — Watch Out for the Shark

A shark actively patrols this area of the shipwreck. Keep an eye on the white threat indicator on your screen. When it starts filling up, the shark has spotted you. Swim past it carefully and do not linger in the open water near the wreck. You can use schools of fish to blend in and break the shark’s line of sight if needed.

Step 4 — Use the Air Barrel Before Going Deeper

This step is important. Before you descend into the trench, swim toward the end of the shipwreck and find the air barrel attached to it. Use it to completely refill your oxygen meter. You are going to need a full tank for the descent. Do not skip this step or you will run out of air before reaching the bottom.

Step 5 — Dive Down into the Trench

From the air barrel, look down and slightly west. You will see a massive rocky trench cutting through the zone below you. Dive straight down and keep swimming deeper until the ocean floor renders in beneath you. Keep going until you physically cannot go any further down.

broken diving bell in ac black flag resynced

Step 6 — Find the Broken Diving Bell

At the very bottom of the trench, you are looking for a broken or sunken diving bell resting on the ocean floor. This is the marker that confirms you are at the lowest point on the map. Swim close to it — and if the trophy or achievement does not pop immediately, physically drag Edward along the sea floor in circles around the bell. Make sure his body is actually touching the ground, not just hovering above it.

Once the game registers that you have reached the lowest point, the Davy Jones’s Locker trophy or achievement unlocks.

What to Do If the Trophy Does Not Unlock

This is a known issue that several players have reported. The trigger zone at the bottom of The Black Trench can be slightly buggy. If you swim to the broken diving bell and nothing happens, here is what to do:

Swim tight circles around the broken bell and press Edward into the sea floor as hard as possible.
Make sure you are not just near the bell — you need to actually be at the very deepest point of the trench, touching the ocean floor.
If it still does not pop, surface, return to the Jackdaw, and attempt the dive again from the beginning.
A fresh dive usually forces the game to re-register your position and the trophy unlocks on the second or third attempt.

Do not panic if the notification does not come instantly. Give it a few seconds at the bottom before assuming something has gone wrong.

Loot the Black Trench While You Are Down There

Since you are already at The Black Trench, you might as well grab everything. This diving location has multiple treasure chests scattered through the wreckage along with the secret chest that drops the Espada Ancha cutlass. All standard chests here contain Reales and valuables.

Opening all treasure chests across all seven underwater shipwrecks in the game also counts toward the Seven Deadly Seas trophy and achievement, so every dive you complete here contributes to that too.

For help tracking down loot across the whole map, our AC Black Flag Resynced treasure map locations guide and Blackbeard treasure map guide are worth bookmarking.

Quick Tips for Underwater Exploration in AC Black Flag Resynced

Always top off your oxygen at every air barrel you find before pushing deeper. Running dry at the bottom of a trench is a guaranteed reset.
Use fish schools for cover. Blending into a group of fish breaks the shark’s focus on you and buys time to move past without getting hit.
Hold L2 or LT while underwater to highlight nearby chests with a white dot — this saves a lot of swimming time when clearing out shipwrecks.
Explore early after Sequence 6. Once the Diving Bell is unlocked, all seven shipwrecks are available. Clearing them before late-game gives you good early resources.
The Dive Anywhere mechanic in Resynced lets Edward swim underwater at any time, even without the Diving Bell. Just remember that the deep Diving Bell zones are still off-limits without it.

More AC Black Flag Resynced Guides

Looking for more help across the game? Here are some useful guides to keep nearby:

Where to Buy Assassin’s Creed Black Flag Resynced

AC Black Flag Resynced is available now on PS5, Xbox Series X|S, and PC:

Frequently Asked Questions

Where is the lowest point on the map in AC Black Flag Resynced?

The lowest point is at The Black Trench in the Castillo de Jagua region, northwest of the map at coordinates 184, 425. You need to use the Diving Bell to enter, then dive to the very bottom of the trench and find the broken diving bell on the ocean floor.

How do I unlock the Davy Jones’s Locker trophy in Black Flag Resynced?

Complete Sequence 6’s Diving for Medicines mission to unlock the Diving Bell, then sail to The Black Trench at coordinates 184, 425. Dive down, top up oxygen at the air barrel attached to the sunken ship, dive deeper into the trench, and find the broken diving bell on the ocean floor. The trophy unlocks when the game registers you at the lowest point.

What do I need before I can reach the lowest point on the map?

You must complete the Diving for Medicines mission in Sequence 6 first. This unlocks the Diving Bell and marks all underwater shipwreck locations on your map. Without the Diving Bell, The Black Trench is too deep to access.

The Davy Jones’s Locker achievement is not unlocking — what should I do?

The trigger can be buggy for some players. Make sure you are physically touching the ocean floor near the broken diving bell, not just hovering above it. Swim tight circles around the bell and press Edward into the ground. If it still does not pop, resurface, return to the Jackdaw, and try the dive again. A fresh attempt usually fixes it.

Is there any loot at The Black Trench?

Yes. The Black Trench has multiple standard treasure chests with Reales and valuables, plus a secret chest that drops the Espada Ancha, a rare cutlass. It is one of the seven underwater shipwrecks that also count toward the Seven Deadly Seas trophy and achievement.