The Fire Barrel Strength Ultimate Plan comes from a buried treasure in San Juan after you first collect the Santanillas treasure map at coordinates 191, 218.
This is a treasure-map buried chest route, not a diving-bell chest route. Start by getting the map on Santanillas, then use its San Juan clue to reach the cave dig spot and claim the plan.
- Fire Barrel Strength Ultimate Plan locations
- How to get the Fire Barrel Strength Ultimate Plan in Assassin’s Creed IV: Black Flag
- San Juan cave route and dig spot
- What the Fire Barrel Strength plan unlocks
- Fire Barrel Strength location mistakes
- Other Ultimate Plan searches near this one
- Frequently Asked Questions
Fire Barrel Strength Ultimate Plan locations
| Item | Location |
|---|---|
| Treasure map | Santanillas, around 191, 218 |
| Buried chest | San Juan, inside the cave reached through the underwater tunnel |
| Reward | Fire Barrel Strength Ultimate Plan |
The route has two parts: the map and the buried chest. The plan then unlocks the last Fire Barrel Strength tier for the Jackdaw at a harbourmaster.
How to get the Fire Barrel Strength Ultimate Plan in Assassin’s Creed IV: Black Flag
Follow the Santanillas map route first, then use the San Juan cave route to dig up the buried plan.
STEP 1/14
Fast travel to Santanillas
Travel to Santanillas and start from the island’s fast travel point.
STEP 2/14
Move left along the coastline
Follow the coastline down to the left until the landmark area opens up.
STEP 3/14
Find the stone pillars
Use the pillars as your main marker for the treasure-map path.
STEP 4/14
Ignore or rescue the captives
The two captives nearby are optional; rescuing them cleanly can count toward an achievement, but it is not required for this plan.
STEP 5/14
Take the path above the pillars
Climb toward the raised path behind the pillars, using the nearby hill route and tree branches around it.
STEP 6/14
Pick up the treasure map
Loot the map on top of the small cliff or hill at Santanillas 191, 218.
STEP 7/14
Check the San Juan clue
KEY!After collecting the map, open the codex from the start menu to see the clue pointing you to San Juan.
STEP 8/14
Travel to San Juan
Sail or fast travel to San Juan on the west side of the map.
STEP 9/14
Stop by the rock and broken ship
Look for the shoreline area between a rock and a broken-down boat or ship wreckage.
STEP 10/14
Dive near the jellyfish
Go underwater and use the jellyfish as the marker for the cave entrance.
STEP 11/14
Swim north through the tunnel
Follow the underwater passage north through the long tunnel.
STEP 12/14
Surface inside the cave
Climb out in the cave area where the guards are waiting.
STEP 13/14
Clear the guards
Take out the nearby guards before searching for the dig spot.
STEP 14/14
Dig at the dirt patch
Use the dirt patch near the first cave area, right of the ramp or just before the wooden scaffold, to uncover the buried treasure.
Video help
San Juan cave route and dig spot
At San Juan, do not waste time sweeping the outer beach. The useful entrance is offshore near the broken boat area, where the jellyfish lead into an underwater tunnel that runs toward the cave.
Once you surface, the plan is close by. Clear the first guards, then look near the right side of the ramp or just before the wooden scaffold. The dirt patch there gives the Dig Up prompt for the buried chest.
Collect the Santanillas map before searching San Juan; the cave route matters, but the buried plan route starts with the map at 191, 218.
What the Fire Barrel Strength plan unlocks
The buried chest gives you the Fire Barrel Strength Ultimate Plan, but that is not the upgrade purchase itself. Take the plan to a harbourmaster to unlock the final Fire Barrel Strength tier for the Jackdaw.
Fire Barrel Strength location mistakes
The most common mistake is going straight to San Juan before collecting the Santanillas treasure map. Start with the map, then follow the clue to the buried chest.
Another easy miss is searching the visible shoreline instead of entering the cave. The chest is not lying out on the beach; it is inside the cave reached by diving near the jellyfish and swimming through the underwater passage.
Also keep Fire Barrel Strength separate from Fire Barrel Storage. Strength is the San Juan buried treasure tied to the Santanillas map, while Storage is a different Ultimate Plan route.
Other Ultimate Plan searches near this one
If you are cleaning up Jackdaw upgrades, the next confusion point is usually Fire Barrel Storage, which is not found in the same San Juan chest. Other Ultimate Plans can come from diving-bell shipwreck chests or separate treasure maps, so match the plan name before chasing coordinates.
Frequently Asked Questions
Do you need the Santanillas treasure map first?
Yes. Get the Santanillas treasure map at around 191, 218 before digging up the San Juan chest.
Where exactly is the San Juan dig spot?
It is inside the cave reached through the underwater tunnel. After surfacing, check the dirt patch near the first cave area, on the right side of the ramp or just before the wooden scaffold.
Is this the same as Fire Barrel Storage?
No. Fire Barrel Strength and Fire Barrel Storage are separate Jackdaw upgrade plans with different routes.
Do you need the Diving Bell for this plan?
No. This plan uses a shore dive into an underwater tunnel at San Juan, not a Diving Bell shipwreck chest.
What do you do after finding the plan?
Visit any harbourmaster and use the plan to access the final Fire Barrel Strength upgrade tier for the Jackdaw.
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