Sora Tanka
As a lifelong otaku and pop culture enthusiast, I spend my time exploring underground animation, vintage cinema, and the hidden gems of streaming media. Through my writing, I aim to bring light to overlooked classics and guide fellow fans toward unique experiences. Find me on Instagram, Facebook, X, and LinkedIn.
Published: October 29, 2026 | 14 min read | Last updated: October 29, 2026
Unknown Worlds just pulled the gaming version of sneaking a submarine into your garage while you slept. No patch notes. No trailer. A roughly 9.5GB experimental build quietly landed, and buried inside it is the Subnautica 2 Trident submarine, the long awaited successor to the Cyclops. Players opened the branch expecting bug fixes and found a whole new region, a pool table on the ocean floor, and a reactor powered sub with a mutiny backstory.
In this guide you will learn what the stealth update added, where the Trident wreck sits, the full repair path and recipe, how it compares to the Cyclops, what the lore logs reveal, how to join the experimental branch without nuking your saves, and what it all means for Early Access 2. Grab your air tank. We are going deep.
⚡ Quick Answer
The Subnautica 2 stealth update is a big experimental branch build (version 136215, about 9.5GB) adding the Tar Delta region, new creatures, the Seafrog chassis, and an early Trident submarine. You can follow the repair path to the buried wreck, but the finished sub only spawns through console commands for now.
What Did the Subnautica 2 Stealth Update Actually Add?
The new build is listed as experimental version 0.2.0.0 (build 136215). It appeared in the final week of October 2026 without the usual announcement post. That surprised players, because Unknown Worlds normally explains its updates in detail. This time the community found everything by playing, data mining, and poking at debug commands.
The short version: this is a preview of Early Access 2 content. The studio began its "Voyage to Early Access 2" developer vlog series on October 15, so the timing makes sense. The drop gives us a playable slice of what the next big update will look like, even if half of it is still gray blockout geometry.
| Category | What Is New in the Experimental Build |
|---|---|
| New region | Tar Delta, with Collection Zone, Great Jaw Farms, Homestead Ruins, Tar Flats, and Tar Trenches |
| Vehicles | Tadpole Seafrog Chassis (the mech suit style upgrade) and an early Trident submarine |
| Creatures | Tar Crab, Tar Eel, Rift Jelly, Trench Lantern, Snorkelback, Song Star, Porcupine Raion, and more |
| Tools and items | EMT Tool, Hydraulic Bulb, Tar Graphene, Needler Egg, Cooked Sea Olive, Amber-eyed Kelp Spore |
| Base parts | Round Room, Radiothermal Generator, Resource Crusher, Axum Crate and Barrel, Coat Rack, Pool Table, two rugs |
| Quality of life | Overhauled UI, new character customization with Scope and Lance Pioneers, Polish and Turkish language support, Vehicle Fabricator animations |
Yes, there is a pool table. You are stranded on an alien ocean planet with leviathans circling, and somebody decided billiards was essential. Honestly? Correct priorities.
What Is the Subnautica 2 Trident Submarine?
The Trident is a long range exploration submersible. Think of it as a mobile base you can actually steer. It sits at the top of the vehicle ladder, above the Tadpole and its chassis variants, and it fills the role the Cyclops played in the first game.
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Here is what the developers have said about it so far:
- It cannot be fully destroyed. The Cyclops could explode and take your hopes and dreams with it. The Trident can be knocked out of commission, but you will always be able to repair it.
- You find it, you do not craft it. Only one Trident exists in each world, so in co-op your whole server shares the same sub.
- Solo friendly, co-op ready. The team plans separate "jobs" for up to four co-op players, but you will never need four people to run it.
- Modular interior is on the table. The lead developer has floated a mix of free build space and swappable prebuilt rooms.
- The original Cyclops designer returned. Concept artist Pat Presley, who designed the Cyclops, came back to design this one.
Is It Called the Trident or the Big Sub?
Both names float around. Internally, the vehicle has also gone by "BigSub". Earlier in development, the internal name reportedly moved away from Trident over possible trademark concerns, and because the name implied too much. The current experimental build and most players still call it the Trident, but do not be shocked if the final release ships with a different name.
Where Is the Subnautica 2 Trident Submarine and How Do You Repair It?
The Trident wreck sits buried in the Tar Delta. In the story, the Axum faction appears to have hidden it there on purpose. Getting it back online is a proper questline, not a single crafting click. Here is the full path in order:
- Build the Seafrog chassis: Collect the chassis parts from the Alterra starship wreckage in the deep zone. The Seafrog is the only thing tough enough to smash through the Axum barricade blocking the endgame area.
- Power up the facility: Restore power to the nearby plant to open the sealed door into the endgame zone.
- Grab the Depth Module MK2: It sits inside the facility and you will want it before heading deeper.
- Drain the construction site: The Trident dry dock is flooded. Use the EMT Tool (affectionately, the fancy alien wrench) and the drainage device to clear the water.
- Scan and repair the power core: Scan the damaged Axum reactor with the Bioscanner, then repair it with the Habitat Builder.
- Distract the leviathans: Use the Leviathan Harp to pull nearby leviathans away so you can reach the deep nest.
- Build and install the Molten Reactor Fuel Cell: Retrieve the molten sodium fuel component, construct the fuel cell, and slot it into the reactor cradle. Main power comes online and the Trident boots up with its welcome sequence.
Trident Reactor Repair Recipe
This is the part almost nobody has written down yet. Repairing the damaged reactor with the Habitat Builder currently costs:
| Material | Amount |
|---|---|
| Plasteel Ingot | 3 |
| Volatile Acid | 3 |
| Methane Clathrate (the fire ice clusters in the deep zone) | 2 |
💡 Pro Tip: The Leviathan Harp only works after you have the EMT Tool. If the tuning dial confuses you, crank it all the way to the right. That reliably triggers the acoustic sequence and pulls the leviathans toward the harp instead of toward your face.
Can You Actually Drive the Trident Yet?
Not really, and this is the most important thing to know before you switch branches. The experimental patch lists the Trident as an "early implementation" available through commands only. You can complete the restoration questline, but the screen you get at the end hints that piloting the sub will come in a later update.
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Players who spawn it through debug commands get to walk around a blockout version of the interior. Inside you can already spot:
- An automated welcome sequence that greets you as captain
- An internal docking bay sized for the Tadpole
- Oxygenators and storage bays
- Voice logs tied to the sub's secret origin (more on that below)
The same commands can also spawn a classic Cyclops model. Before you get excited, it seems to be there as a size reference for the developers, not as a returning vehicle. Putting the two side by side shows just how much bigger the Trident is.
⚠️ Important: Debug commands, God mode, and spawn commands are available on the experimental branch for testing only. They will likely be removed from stable releases, and everything you see inside the Trident uses placeholder models that will change.
Subnautica 2 Trident Submarine vs Cyclops: What Changed?
Veterans of the first game have one question: is this just the Cyclops with a new paint job? Based on what is in the build and what the developers have said, the answer is no.
| Feature | Cyclops (Subnautica) | Trident (Subnautica 2, in development) |
|---|---|---|
| How you get it | Crafted from blueprints | Found as a buried wreck and restored, one per world |
| Destruction | Could be destroyed permanently | Can be disabled but always repairable |
| Crew | Single player game | Solo friendly, with planned roles for up to four co-op players |
| Power | Swappable power cells | Axum reactor running on a Molten Reactor Fuel Cell |
| Docking | Docked smaller vehicles | Internal bay for the Tadpole |
| Interior | Fixed layout with limited furniture | Possible mix of free build space and swappable rooms |
| Designer | Pat Presley | Pat Presley, back for the sequel |
The biggest shift is the "one sub per world" design. In the first game, losing your Cyclops to a Reaper was a rite of passage. Here, the sub is a shared, permanent home that your whole crew works to restore. That turns the Trident from a tool into a story goal, which is a smart way to make the endgame feel earned.
What New Creatures, Biomes, and Tools Are in the Experimental Branch?
The Tar Delta and Its Five Biomes
The Tar Delta is the headline region, and it is dark, sticky, and deeply rude. It spans five biomes: the Collection Zone, Great Jaw Farms, Homestead Ruins, Tar Flats, and Tar Trenches. Players have long expected the next update to take them into the home of the Collector Leviathan, and this region delivers exactly that. Expect giant underwater collector structures, methane clusters, deep caves, and faction barricades everywhere you look.
New Creatures Worth Knowing
- Tar Crab: The first thing most players spot. It looks surprisingly polished for an experimental build.
- Tar Eel: Hostile, but it seems to leave you alone unless you disturb it. Players suspect it is blind, so do not hover right on top of tar clusters.
- Rift Jelly: A glowing drifter found in the deep zone.
- Trench Lantern: Small glowing cephalopods at the center of the newest lore theory.
- Also new: Snorkelback, Song Star, Porcupine Raion, Flame Exile, Longbaby Exile, Droopy Flip, Pumpkin Tass, and the gloriously named Drunken Noodle.
New Tools, Gear, and Base Parts
- EMT Tool: The alien wrench that unlocks most of the Trident questline and the Leviathan Harp.
- Seafrog Chassis: A legged, armed Tadpole upgrade in the spirit of the old Prawn Suit, built to break barricades.
- Depth Module MK2: Pushes your vehicles deeper into the trenches.
- Resource Crusher: A base part that grinds raw materials into advanced crafting components.
- High Capacity Air Tank: Found near the Alterra wreck. Your lungs will thank you.
- Leviathan Harp: An acoustic lure that pulls leviathans away from where you need to go.
- Resonators: Feedback, Sonic, and Axum Resonators all appear in the build.
- Radiothermal Generator: A new power option that matters a lot for deep bases where thermal and solar options get thin.
- Round Room: The fan favorite base piece finally returns.
What Is It Like Playing the Trident Questline?
I switched to the experimental branch the moment I saw people whispering about it. The first thing I noticed was how different the Tar Delta feels from the rest of the map. The earlier biomes feel like you are visiting someone's aquarium. This place feels like you are trespassing. The collector structures loom over everything, and the first time a leviathan signature showed up on my HUD while I was halfway through draining the dry dock, I genuinely muttered "absolutely not" at my monitor.
What surprised me most was how story driven the restoration is. Seeing the Trident's reactor flicker on after hauling the fuel cell back felt like the moment you first power up a Cyclops, multiplied by ten. Then I walked inside, saw the gray blockout walls, and remembered this is very much a preview. My honest take: play it for the region and the story beats, but do not expect a finished submarine fantasy yet.
What Do the Noah and Sophie Logs Reveal About the Trident?
The Trident is not just a vehicle. It is evidence of a conspiracy. A log in the experimental build reveals that Sophie was the creator, or one of the creators, of the sub, and that it was built to be invisible to NoA, the ship AI that players usually hear as "Noah". The voice logs inside the Trident describe a mutiny, and the sub appears to be Sophie's secret exit plan.
Meanwhile, new NoA audio logs back at base get unsettling fast. The AI talks about immortality, bodily resets, and toxin buildup, which lines up with the community theory that NoA keeps wiping and reprinting players when contamination builds up in Sleep Bay 3.
Here is my read on why this matters. If the Trident was built specifically to hide from NoA, then restoring it is probably not just about exploring further. It may be your way out of NoA's loop. That would make the sub the center of the Early Access 2 story, not a side reward. This is speculation, but the pieces fit.
Fun detail: players found Axum interface chips marked "DNL" in the build. The community has decided it stands for "Do Not Leak". Whether that is true or not, it is a very funny label to find inside a stealth update that leaked itself.
Are Trench Lanterns Baby Collector Leviathans?
This is the hottest theory right now. The new PDA entries point out shared bioluminescence patterns, similar mantles, and matching tentacle markings between the small Trench Lanterns and the massive Collector Leviathans. If true, the trenches are a nursery, which explains why the adults are so aggressive there. Nothing is confirmed, but the evidence is stronger than most fan theories get.
How Do You Join the Subnautica 2 Experimental Branch?
On Steam
- Open your library: Right click Subnautica 2 in your Steam Library.
- Go to Properties: Select Properties from the menu.
- Find the betas tab: Open the Game Versions and Betas tab.
- Pick Experimental: In the Beta Participation dropdown, choose the Experimental branch.
- Let it download: Close the window and Steam starts the download automatically.
On Xbox or PC Game Pass
- Check eligibility: You must be 18 or older and either own Subnautica 2 or have Game Pass Ultimate.
- Install Xbox Insider Hub: It is free in the Store on console and PC.
- Open Previews: Sign in and go to the Previews section.
- Join the test: Select Subnautica 2 Experimental (Public Test) and click Join.
- Install: Wait for registration, then follow the install prompt. A console restart may be needed.
⚠️ Important: Experimental and main branch saves are not compatible and cannot be imported in either direction. Co-op only works if every player is on the experimental branch. Mods built for the stable build may crash the experimental one, so disable them before switching.
💡 Pro Tip: Want peace of mind? Back up your saves first. On PC, main branch saves live in %LOCALAPPDATA%\Subnautica2\Saved\SaveGames, while experimental saves sit inside the game install folder at steamapps\common\Subnautica2\Subnautica2\Saved\SaveGames. The two folders do not touch each other.
What Are Subnautica 2 Players Complaining About?
Not everyone is celebrating. The main frustrations in the community right now:
- Silent drops: Big experimental changes without patch notes catch modders and casual players off guard.
- Save file bloat: Leftover base building data caused stuttering over long playthroughs. The first Buddy System hotfix specifically cleaned up base spawn data and lingering construction ghost data to cut this down.
- Leviathan pathing: In experimental builds, leviathans sometimes clip through terrain or go after unpiloted vehicles, leading to deaths that feel unfair.
- Slow lore delivery: Some players want a skip option for longer voice lines.
- No EA2 date: A big preview with no release window leaves some fans feeling teased.
Subnautica 2 Update Timeline: Every Major Patch So Far
| Date (2026) | Update | Highlights |
|---|---|---|
| May 14 | Early Access launch | Steam, Epic, Xbox, and Game Pass with four player crossplay co-op |
| July 8 | EA 1.1: Adaptive Measures | Big quality of life pass |
| August 12 | Experimental branch opens | Early trench content and first Trident hints in the files |
| August 19 | EA 1.2: Buddy System | Crossplay proximity voice chat, revives, emotes, inventory trading, tracking tags |
| September 1 | Buddy System Hotfix 1 | Save bloat cleanup, Collector Leviathan pathing fixes |
| September 30 | Experimental update | Trident engine core and trench terrain changes |
| October 6 | Buddy System Hotfix 2 | Voice chat detection, Tadpole docking, and scanner accuracy fixes |
| October 15 | Voyage to Early Access 2 | Developer vlog series begins previewing EA2 |
| Late October | The stealth update | Tar Delta, Seafrog, Trident restoration questline |
📊 Key Stat: Subnautica 2 sold one million copies in its first hour, two million within 12 hours, and passed four million just five days after its Early Access launch.
📊 Key Stat: The game peaked at 467,582 concurrent players on Steam alone and about 651,000 across Steam, Epic, and Xbox combined.
Numbers like that explain why every experimental build gets picked apart within hours. Millions of players are watching this ocean very closely.
When Is Subnautica 2 Early Access 2 Coming Out?
There is no date yet. What we do know is that the studio is treating EA2 as its biggest update so far. The plan includes a story expansion, new creatures, a full new region made of five biomes, and the Tadpole chassis with arms and legs. Every one of those already shows up in this experimental build.
"The most substantial update we've done since release."
Experimental builds tend to get updated shortly before major releases. So a drop this big, this complete in terms of region content, is a decent sign that EA2 is getting closer. It is not a guarantee, though. The Trident's restoration ending also suggests that full piloting could be saved for a later patch after EA2.
Looking further out, Unknown Worlds has said Early Access could last around two to three years before version 1.0. Counting from the May 2026 launch, that points to a full release around 2028 or 2029.
Frequently Asked Questions
How do I opt into the Subnautica 2 experimental branch on Steam?
Open your Steam Library, right click Subnautica 2, and choose Properties. Go to the Game Versions and Betas tab, then pick Experimental from the Beta Participation dropdown. Close the window and Steam downloads the build automatically. Your experimental saves live in a separate folder, so your main game stays safe.
Is the Trident submarine craftable in Subnautica 2 right now?
No. On the main Early Access build the Trident does not exist yet. On the experimental branch you can restore its buried wreck, but the full vehicle only spawns through console commands. Current plans point to it being found rather than crafted, with only one Trident existing in each world.
Where is the Trident submarine located in Subnautica 2?
The Trident wreck sits buried in the Tar Delta, the new deep region added in the experimental branch. You reach it by working through Axum barricades with the Seafrog, powering a facility to open the endgame area, and then draining the flooded construction site before repairing its reactor.
What does the Leviathan Harp do in Subnautica 2?
The Leviathan Harp is an acoustic device that pulls nearby leviathans toward its sound, clearing a safer path for you. You can only use it after getting the EMT Tool. If the tuning confuses you, turn the dial all the way to the right to trigger the distraction sequence.
When is Subnautica 2 Early Access 2 coming out?
Unknown Worlds has not announced a date. The studio started its Voyage to Early Access 2 developer vlog series on October 15, 2026, and calls EA2 its most substantial update since launch. Experimental builds typically get updates shortly before major releases, so this drop is a hopeful sign.
Will the Cyclops return in Subnautica 2?
Not as the Cyclops. The Trident is its spiritual successor, and it was designed by Pat Presley, the artist behind the original Cyclops. A Cyclops model does show up in the experimental files, but it appears to be a size reference for developers rather than a returning vehicle.
Will my saves transfer when Early Access 2 launches?
Unknown Worlds has not detailed how Early Access 2 will handle existing main branch saves, so back yours up before it lands. Experimental saves are different: they are stored separately and cannot be imported into the main game, so treat any progress there as a disposable test run.
How long will Subnautica 2 stay in Early Access?
Unknown Worlds has said Early Access could run around two to three years before version 1.0. Since the game launched on May 14, 2026, that points to a full release somewhere around 2028 or 2029, though no official date exists and the roadmap remains subject to change.
Is the Subnautica 2 Trident Worth Switching Branches For?
If you love lore, new biomes, and the thrill of seeing unfinished content before everyone else, absolutely. The Tar Delta is the most atmospheric region in the game so far, the Trident questline gives the endgame real purpose, and the Sophie and NoA logs set up what could be the best story beat in the series. If you only want to cruise around in a finished submarine, hold off. The Trident is still a gray box with big ambitions.
Either way, the stealth update tells us one thing loud and clear: Early Access 2 is taking shape fast, and the sub we have been waiting for since the first game is finally surfacing. Bookmark this page, because I will update it as soon as Unknown Worlds shares a date or a new build lands.
📚 Sources & References
- Trident: Subnautica 2 Wiki, updated October 28, 2026
- Experimental Branch: Subnautica 2 Wiki, updated October 28, 2026
- Subnautica 2 Experimental Branch Thread: Steam Community, October 2026
- Subnautica 2 Buddy System Hotfix 1: Unknown Worlds, September 2026
- Buddy System Hotfix 2 Patch Notes: Wikily, October 2026
- Subnautica 2 Update 2 Brings Proximity Voice Chat: TheSixthAxis, August 19, 2026
- Subnautica 2 Is Getting Scarier With Early Access 2.0: Kotaku, October 2026
- Subnautica 2 Early Access Sales Top Four Million: Gematsu, May 2026
- Subnautica 2 Has Already Sold 2 Million Copies: Gamereactor, May 15, 2026
- Subnautica 2 Crosses 1 Million Sales: Digital Citizen, May 2026
- Subnautica 2 Roadmap: Sub2Wiki, checked October 18, 2026
- Subnautica 2 Roadmap: Next Update and Dates, Subnautica2Map, October 2026
- Subnautica 2: Wikipedia
- Subnautica 2: Steam Store Page, Unknown Worlds Entertainment
