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Island 5 is the Volcano. To unlock its coordinates, complete the Tuna-to-Albatross boss sequence on Rocks Island (Island 4), then deliver the Albatross Head to the island’s shop or quest NPC. After the hand-in, use your Boat Radar to follow the Volcano marker north.
What unlocks Island 5?
The key is finishing the Island 4 quest hand-in—not merely defeating the Albatross. The sequence is: defeat the Tuna, use its body to attract and defeat the Albatross, then give the Albatross Head to the NPC. That hand-in unlocks the Volcano coordinates. How to Fish Wiki and NerdsChalk describe the same practical unlock: complete the hand-in, then navigate with the Radar.
How to reach the Volcano
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Prepare on Rocks Island
Go to Rocks Island, Island 4. Buy the Professional Boss Lure if you have not already obtained it.
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Summon and defeat the Tuna
Use the Professional Boss Lure to summon the Tuna, then defeat it.
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Use the Tuna body to attract the Albatross
Place the Tuna body on land to summon the Albatross, then defeat the bird.
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Deliver the Albatross Head
Pick up the Albatross Head and take it to the shop or quest NPC on Rocks Island. Complete the hand-in and NPC dialogue; this is the step that opens the Volcano coordinates. One walkthrough describes a Flash Drive containing the coordinates as the reward, but the essential requirement reported across guides is completing the head hand-in.
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Navigate north with the Boat Radar
Return to your boat and use the Boat Radar to read the newly available Volcano marker. Follow it north from Rocks Island to reach Island 5.
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If the Volcano marker does not appear
- Confirm that you handed the Albatross Head to the NPC and completed the interaction, rather than stopping after the boss fight.
- Check the Boat Radar for the destination marker after the hand-in; the Radar is used to locate and navigate to the unlocked destination.
What to expect after arriving
The Volcano is the fifth and final story location. Its later quest chain involves the scientist NPC, a Fish Bucket, the Bowhead Whale, and a mutated whale encounter. Those are post-arrival tasks, not requirements for opening Island 5. Guides disagree about whether the scientist’s five-fish hand-in requires fish caught on the Volcano, so that detail should not be treated as settled.
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