How to Disable the Alien Gun in Subnautica
You need to cure yourself of the Kharaa bacterium. Find the Sea Emperor Leviathan, hatch her eggs, and she’ll release the enzyme to cure you. After that, head back to the Quarantine Enforcement Platform, and it will allow you to disable the gun.
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Cure yourself with Enzyme 42, then go to the big gun, and voilà—no more alien gun!
Just cure yourself of the infection and the gun will shut down. Easy peasy.
All about that bacterial cure! Get the hatching enzymes, release the baby Sea Emperors, and you'll get the enzyme 42 to cure yourself. Then go to the Quarantine Enforcement Platform to turn off the gun.
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