Portable Oxygen Generator: unlock, build and use it
Quick answer
Scan two Portable Oxygen Generators in the Great Jaw, then build one with the Habitat Builder using 3 Titanium and 2 Lithium. Insert a charged Basic Battery. Its oxygen reservoir refills over time and supplies a small top-up when used; keep enough oxygen for your return.
“Where to Get LITHIUM Fast in Subnautica 2” by Jay Dunna · May 16, 2026 · Early Access launch window (uploaded 2026-05-16); predates the Adaptive Measures and Buddy System updates
Bring a charged Scanner and plan the return to an oxygen source before entering the Great Jaw.
Unlock the Habitat Builder; reserve 3 Titanium, 2 Lithium and a charged Basic Battery for your generator.
1
Prepare the Great Jaw scan trip
GameSpot places the Great Jaw approximately 280 metres south-southwest of the Lifepod. Treat this as a published approach, not an exact coordinate. Avoid the pink or purple tendons: touching them can close the creature, and GameSpot describes lethal acid inside.
Buddy System stopped bases being built inside the Great Jaw. Plan your return outside the creature and leave before your oxygen reserve gets low. Kingy has not independently recorded this trip.
Older footage · checked Oct 25, 2026 · before Subnautica 2 Early Access 1.2 (Buddy System, August 19, 2026)
On screen: At about 94 m pink tendons stretch across the open mouth of the Great Jaw, a huge pale-blue creature; the diver fires the Sonic Resonator at its fleshy rim and then moves inside to 103 m, threading between the tendons as a warning appears on screen.
Check the guide’s version notes before following older footage.
“Where to Get LITHIUM Fast in Subnautica 2” by Jay Dunna · May 16, 2026 · Early Access launch window (uploaded 2026-05-16); predates the Adaptive Measures and Buddy System updates
On screen: At about 104 m inside the Great Jaw, pink tendons cross toward a purple core; a Scan Portable Oxygen Generator prompt sits over a fragment lodged against the green flesh outside the core while an OXYGEN EFFICIENCY DECREASED warning shows, then a scan notice appears at the left.
Check the guide’s version notes before following older footage.
“Subnautica 2 Portable Oxygen Generator Location. How to Use Portable Oxygen Generator How to Get” by Ape Knight Gaming · May 16, 2026 · Early Access launch window (uploaded 2026-05-16); predates the Adaptive Measures and Buddy System updates
Select Portable Oxygen Generator in the Habitat Builder’s Utility menu and complete a valid placement. The battery is a separate operating requirement. The linked Habitat Builder and battery-charging guides cover preparing the tool and charging a spare.
Older footage · checked Oct 25, 2026 · before Subnautica 2 Early Access 1.2 (Buddy System, August 19, 2026)
On screen: The Habitat Builder's UTILITY tab lists Portable Locker, Beacon, Portable Oxygen Generator and Dive Elevator; with the generator highlighted, its panel says it produces oxygen over time and requires a battery, and lists Titanium and Lithium.
Check the guide’s version notes before following older footage.
“Subnautica 2 Portable Oxygen Generator Location. How to Use Portable Oxygen Generator How to Get” by Ape Knight Gaming · May 16, 2026 · Early Access launch window (uploaded 2026-05-16); predates the Adaptive Measures and Buddy System updates
GameSpot and GameWith report these values. They describe oxygen gained, not a guaranteed number of extra seconds underwater. The reservoir replenishes over time; that does not mean the battery recharges itself.
Insert the charged Basic Battery and allow oxygen to accumulate.
Use the generator’s displayed interaction to take oxygen. It can be carried; GameWith also describes leaving it floating.
Older footage · checked Oct 25, 2026 · before Subnautica 2 Early Access 1.2 (Buddy System, August 19, 2026)
On screen: At 136 m the blue-and-orange Portable Oxygen Generator floats in open water with an interaction prompt; the diver takes hold of it and carries it, and the oxygen readout climbs from 110 to 118.
Check the guide’s version notes before following older footage.
“How to use Portable Oxygen Generator Subnautica 2” by ZaFrostPet · May 16, 2026 · Early Access launch window (uploaded 2026-05-16); predates the Adaptive Measures and Buddy System updates
If a use gives less oxygen, allow more time for the reservoir to fill. Check battery charge as well. Practise a use near a known oxygen source before relying on it during a longer trip.
Use the generator alongside your tank and other oxygen equipment. Kingy has not measured refill speed, battery runtime or breaths per battery, and does not claim an unlimited dive. Vehicle mounting, Advanced Battery compatibility and multiplayer edge cases remain unconfirmed here.
Crafting recipes: sustenance, stations and navigation ↗Corroborates selected meal, water, Fiber and First Aid Kit ingredients; not an exhaustive current-build database. Beacon and Habitat Beacon construction costs and Builder categories. Portable Oxygen Generator materials and Habitat Builder Utility category. Plasteel Ingot at Processor and selected Lithium portions for High Capacity Air Tank and Scout Ray. Silver portions for Standard Air Tank, Wakemaker, Wiring Kit, System Chip, Scanner Station and Silver Ingot. Power Cell table lists 1 Salt, matching Game Checklists and GameWith’s June recipe page.Walkthrough ·
Portable Oxygen Generator fragments and operation ↗Two fragment positions, Builder recipe, Basic Battery, carrying and floating. Published oxygen gains; no measured refill speed or battery runtime.Walkthrough ·
Great Jaw approach and two generator scans ↗Approximate Lifepod approach, two generator scans and tendon/acid hazard. No guaranteed mining escape method or inside-creature base advice adopted. Lithium deposits, Sonic Resonator and later hot caves with Heat Tolerance.Walkthrough ·
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1:45–1:53 · 8 sEntering the Great Jaw between its pink tendons
1:14–1:25 · 11 sScanning a Portable Oxygen Generator fragment inside the Great Jaw
0:31–0:40 · 9 sTaking oxygen from the generator at 136 m