Running into Bloom Cankers that refuse to open in Subnautica 2? You’re not alone. A huge number of players exploring the Angel Comb trench area have run into the same issue, especially after getting the Feedback Resonator upgrade and realizing some cankers still stay completely sealed.
At first, it looks like a bug. But in most cases, the Bloom Cankers not opening in Subnautica 2 is actually tied to hidden progression mechanics involving connected infection nodes scattered around the biome.
The confusing part is that some Bloom Cankers in the exact same area may still open normally, making it seem like the mechanic is broken. That has led many players to assume the Angel Comb section is bugged, especially in Early Access multiplayer sessions. However, community testing across Reddit, Steam forums, and Discord servers suggests the system is usually progression-based rather than completely glitched.
In most situations, players simply need to locate and destroy nearby infection branches before the larger Bloom Cankers unlock. Several of these hidden infection nodes are tucked away inside side caves, vertical trenches, and upper ledges around the biome, making them easy to miss during exploration.
Here’s exactly how the system works, why the Bloom Cankers stay closed, and the best fixes players have discovered so far.
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Why Bloom Cankers Won’t Open in Subnautica 2
The Bloom Cankers inside the Angel Comb region are connected to a larger infection network.
Certain pods act as “main” Bloom Cankers and will not open until nearby infection branches and secondary growths are destroyed first.
This is why many players experience situations where:
- some Bloom Cankers open normally,
- others remain permanently closed,
- and the Feedback Resonator appears to stop working.
The game currently does a poor job explaining this mechanic during Early Access, which has caused a lot of confusion across Reddit, Steam forums, and Discord communities.
How to Open Bloom Cankers in Subnautica 2
If your Bloom Cankers are not opening in Subnautica 2, follow these steps carefully. A lot of players assume the mechanic is bugged at first, but the issue is usually tied to hidden progression requirements inside the Angel Comb biome.
Destroy All Connected Infection Nodes
The biggest thing players miss is that the Angel Comb area contains several hidden infection branches connected to the larger Bloom Cankers.
Before the main Bloom Cankers unlock, you must destroy all nearby infection growths first. Until those connected nodes are cleared, certain cankers will remain permanently sealed no matter how close you get or which tool upgrade you have equipped.
Carefully search the surrounding area for:
- side tunnels,
- hidden caves,
- upper ledges,
- vertical trench paths,
- and secondary infection roots attached to the biome walls.
Several hidden Bloom nodes are extremely easy to overlook because they naturally blend into the environment. Some are tucked behind terrain, while others are hidden above the trench or inside small side chambers branching away from the main Angel Comb structure.
A good strategy is to follow every infected root and tendon path you can find. In most cases, those branches eventually lead to another infection node that must be destroyed before the main Bloom Cankers finally open.
Follow Every Root and Tendon Path
One of the most reliable ways to solve the Bloom Canker puzzle in Subnautica 2 is to carefully follow every infected root and tendon path branching away from the Angel Comb biome.
Most of the hidden infection nodes are directly connected to these glowing tendons, and they often lead to smaller growths hidden deeper inside the trench system. If you simply focus on the large central Bloom Cankers, it’s very easy to miss the secondary branches required for progression.
Players commonly overlook:
- upper cave entrances,
- narrow side tunnels,
- small hidden chambers,
- and infection clusters tucked behind rocks or terrain walls.
Some infection branches also extend vertically above the main trench area, which is why many players accidentally swim past them during exploration.
If even one infection branch remains active, the larger Bloom Cankers may stay permanently locked. That’s why it’s important to fully clear every connected node before assuming the area is bugged or that the Feedback Resonator upgrade is not working correctly.
If you’re stuck, slowly tracing each infected root through the biome is usually the fastest way to locate the final hidden Bloom node and trigger the main pods to open.
Use the Upgraded Feedback Resonator
Some Bloom Cankers require the upgraded Feedback Resonator before they properly react.
If a Bloom Canker:
- briefly opens,
- pulses,
- or closes when you approach,
then you likely need the Resonator upgrade.
However, if the Bloom Canker never reacts at all, the issue is usually progression-related rather than tool-related.
Is the Bloom Canker Issue a Bug?
Sometimes yes.
While the progression mechanic itself appears intentional, players have also discovered genuine Early Access bugs affecting Bloom Cankers in Subnautica 2.
Reported issues include:
- Bloom Cankers staying sealed after all branches are destroyed,
- multiplayer desync problems,
- infection nodes not registering correctly,
- and progression breaking after reloading saves.
This is especially common in co-op sessions.
Best Fixes for Bloom Cankers Not Opening
If you believe you already destroyed every infection node and the Bloom Cankers still will not open in Subnautica 2, there are several fixes the community has found that can sometimes resolve the issue. Since the game is currently in Early Access, certain Bloom Canker progression states can occasionally bug out, especially during longer sessions or multiplayer playthroughs.
Here are the best fixes players have discovered so far.
Save and Reload the Game
One of the simplest fixes is also one of the most effective.
Many players reported Bloom Cankers reopening correctly after saving the game and fully restarting Subnautica 2. This appears to refresh the infection progression system and can sometimes force stuck Bloom nodes to update properly.
If the main pod refuses to react even after clearing nearby infection branches, try restarting before doing anything else.
Leave the Biome and Return
Another common fix is to temporarily leave the Angel Comb area entirely.
Travel to another biome, explore for a few minutes, then return to the trench. Several players noticed the Bloom Canker state refreshed after unloading and reloading the biome naturally through exploration.
This can sometimes fix:
- sealed pods,
- inactive infection nodes,
- or Bloom Cankers that stop responding to the Feedback Resonator.
Restart Multiplayer Sessions
If you are playing co-op, multiplayer desync can occasionally break Bloom Canker progression.
Players have reported cases where:
- infection nodes appeared destroyed for one player,
- but remained active for the host,
- preventing the larger Bloom Cankers from opening properly.
Fully restarting the multiplayer lobby is currently one of the best fixes for this issue.
Double-Check Hidden Side Branches
The most common problem is still a missed infection cluster hidden somewhere nearby.
Before assuming the area is bugged, carefully recheck:
- upper ledges,
- deeper trench sections,
- vertical cave paths,
- and branching side chambers connected to the infected roots.
Some hidden Bloom nodes are extremely well concealed and easy to miss during normal exploration. Even one active infection branch can keep the larger Bloom Cankers permanently locked.
How to Tell If You’re Missing a Bloom Node
Usually, the signs are obvious once you know what to look for.
You are probably missing a hidden infection branch if:
- some Bloom Cankers open normally,
- others stay permanently sealed,
- nearby infected roots still glow,
- or the main pod never reacts at all.
That almost always means another infection node still exists somewhere in the biome.
Subnautica 2 Bloom Canker Progression Explained
The Bloom Canker system essentially works like a linked weak-point puzzle.
You cannot destroy the main infection until all connected support growths are removed first.
Think of the smaller Bloom nodes as locks preventing the central pod from opening.
Once every linked infection branch is destroyed:
- the main Bloom Cankers unlock,
- the pods open correctly,
- and progression continues normally.
FAQ
Why are Bloom Cankers not opening in Subnautica 2?
Most Bloom Cankers stay closed because nearby infection branches and connected growth nodes have not been destroyed yet. In the Angel Comb biome, several Bloom Cankers are tied to a progression system that requires players to clear linked infection clusters before the larger pods unlock.
Do you need the Feedback Resonator upgrade?
Yes. Certain Bloom Cankers in Subnautica 2 only respond properly after upgrading the Feedback Resonator. If a pod briefly reacts or partially opens before sealing again, you likely need the upgraded version of the tool.
Is the Angel Comb Bloom Canker area bugged?
Sometimes. While the Bloom Canker mechanic itself appears intentional, Early Access players have reported progression bugs, unresponsive infection nodes, and multiplayer desync issues that can occasionally prevent the pods from opening correctly.
Can multiplayer break Bloom Cankers?
Yes. Several co-op players have reported Bloom Canker progression breaking during multiplayer sessions. In some cases, infection nodes appear destroyed for one player but remain active for the host, preventing the larger Bloom Cankers from unlocking properly.
Are Bloom Cankers tied to progression?
Yes. The Bloom Cankers are directly connected to a progression mechanic that requires players to destroy linked infection branches first. Until every connected node is cleared, some main Bloom Cankers may remain permanently sealed.
What is the best fix for Bloom Cankers staying closed?
The most reliable fix players have found is to:
- clear all connected infection nodes,
- carefully search hidden side caves and trench paths,
- leave the Angel Comb biome,
- save and reload the game,
- then return with the upgraded Feedback Resonator equipped.
In most cases, one missed infection branch is the main reason the Bloom Cankers refuse to open.