What to know
- You must begin Oliver’s quest in Lost Jungle to unlock Toxic Tunnel.
- Five NPCs at the Oil Rig near Roslet Volcano each require a specific item.
- Once all items are delivered, the crew clears the boulder blocking the tunnel.
- The tunnel remains filled with poison for now, but unlocking it prepares you for upcoming updates.
The Toxic Tunnel is one of the more mysterious locked areas in Fisch on Roblox, and if you have been wondering how to access it, the process is surprisingly straightforward once you know where to start. You will not unlock it through random exploration or fishing alone. Instead, you need to complete a short but item-specific quest chain tied to Oliver in Lost Jungle.
Below is a quick overview before we dive into the full walkthrough.
| Requirement | Details |
|---|---|
| Quest Giver | Oliver |
| Starting Location | Lost Jungle |
| Key Area | Oil Rig near Roslet Volcano |
| Total NPCs to Recruit | 5 |
| Objective | Deliver required items to each NPC |
| Final Step | Return to Oliver to reveal Toxic Tunnel |
| Tunnel Status | Entrance unlocked, interior still toxic |
Starting Oliver’s quest in Lost Jungle
To begin the process, you need to travel to Lost Jungle and locate Oliver. He is the only NPC who can initiate the Toxic Tunnel unlock sequence. Once you speak to him, he explains that a large boulder is blocking access to the tunnel and that he needs a demolition crew to clear it.
You cannot skip this dialogue or trigger the event in any other way. If you have not spoken to Oliver, the Oil Rig crew will not respond to you properly.
After accepting the quest, your objective updates to gathering five specific NPCs from the Oil Rig near Roslet Volcano.
Finding the demolition crew at the Oil Rig
The next major step takes you to the Oil Rig located near Roslet Volcano. This structure serves as the hub for the five NPCs Oliver needs. Each one agrees to help, but only after you bring them a specific item.
Crew requirements at a glance
| NPC Name | Required Item |
|---|---|
| Hayden | Banana |
| Paul | Atlantean Captain’s Goldfish |
| Theo | Pufferflute Fish |
| Samuel | Rubber Ducky |
| Elias | Sea Mine |
Every NPC has a strict item requirement. You cannot substitute similar items. Make sure you bring the exact object listed, or the dialogue will not progress.
How to deliver items to each NPC
Hayden and the banana requirement
Hayden is one of the simpler crew members to satisfy. He asks for a banana before agreeing to join the demolition team. Once you hand it over, he confirms participation and prepares to relocate.
Paul and the Atlantean Captain’s Goldfish
Paul requires the Atlantean Captain’s Goldfish, which is a more specific fishing catch. This fish must match the exact quest requirement, so double-check the name before turning it in. Once delivered, Paul confirms and prepares for transport.
Theo and the Pufferflute Fish
Theo’s requirement is the Pufferflute Fish. Like Paul’s item, this is a distinct catch. Ensure you are not confusing it with other puffer-type fish. When handed over, Theo locks in his participation.
Samuel and the Rubber Ducky
Samuel’s request stands out because it is not a fish. He needs a Rubber Ducky. This item must be collected before interacting with him if you want immediate progress. Delivering it completes his recruitment step.
Elias and the Sea Mine
Elias requires a Sea Mine. This is one of the more unusual items in the quest chain. Without the Sea Mine, Elias will not join the crew, and the quest cannot progress further.
Once you hand over the Sea Mine, all five crew members are successfully recruited.
What happens after all items are delivered
After each NPC has received their required item, they will automatically teleport to Lost Jungle. You do not need to escort them manually. The teleport only triggers once each individual item has been properly delivered.
Return to Lost Jungle and locate Oliver again. When you speak to him after all five NPCs are present, a short event triggers where the demolition crew removes the massive boulder blocking the Toxic Tunnel entrance.
This interaction officially unlocks the Toxic Tunnel entrance.
Toxic Tunnel status after unlocking
Even though the entrance becomes accessible, you will quickly notice that the interior remains filled with poison. You cannot fully explore it yet because the toxic environment still blocks deeper progression.
However, unlocking the entrance is crucial. It flags your account progression and prepares you for future updates where the Toxic Tunnel is expected to become fully explorable.
While this quest does not currently grant a traditional item reward, it unlocks permanent map progression.
| Reward Type | Details |
|---|---|
| Map Progression | Toxic Tunnel entrance revealed |
| Future Content Access | Prepared for upcoming updates |
| NPC Relocation | Demolition crew moves to Lost Jungle |
| Exploration Expansion | New accessible zone entrance |
The primary reward is long-term progression rather than immediate loot.
Why unlocking Toxic Tunnel now is a good move
You might wonder why you should unlock the Toxic Tunnel if it is still filled with poison. The answer is simple. Future updates will likely expand this area, and early completion ensures you are ready without needing to backtrack.
In live-service Roblox experiences like Fisch, progression gates often unlock new fish, rare materials, or limited-time content. Completing Oliver’s quest now ensures you stay ahead of upcoming expansions.
Unlocking Toxic Tunnel in Fisch comes down to starting Oliver’s quest in Lost Jungle, gathering five very specific items for the Oil Rig crew, and triggering the demolition event. The process is item-driven and cannot be bypassed. Once completed, the entrance becomes accessible even though the toxic interior remains sealed for now.
If you follow the steps carefully and bring the exact required items, you can unlock the Toxic Tunnel in one focused session and position yourself perfectly for future updates.
