You’re floating in the freezing waters of Sector Zero, the silence is deafening, and then you hear it. That low, vibrating rumble that seems to shake your very marrow. If you’ve spent any time in the Subnautica universe, you know that sound. It means you aren't the biggest thing in the pond anymore. Not by a long shot.
Talking about all leviathans in Subnautica Below Zero isn't just a matter of listing big fish; it's about understanding the ecosystem of Planet 4546B. This game takes a slightly different approach than the original 2018 title. While the first game felt like a vast, lonely ocean where Reapers could snag you from any direction, Below Zero is tighter. It’s more claustrophobic. The threats are often literally right on top of you, lurking in the twisty bridges or frozen in the ice walls.
The Gentle Giants That Just Want To Exist
Not everything with a "Leviathan" classification wants to eat your Seamoth—or in this case, your Seatruck.
Take the Glow Whale. These things are massive, majestic, and honestly, kind of a relief to see. You'll find them in the East Arctic and the Lilypad Islands. They have these incredible glowing "ears" or horns that light up the dark water. What’s cool is that they’re actually interactive. You can swim up to them and interact with their "blowhole" area to hitch a ride or just give them a pat. It’s one of the few moments of pure peace you get in the game. They don't have teeth. They don't care about you. They’re just filter-feeding through the currents, living their best lives while you're panicking about your oxygen levels.
Then there are the Titan Holefish. They're basically just huge versions of the little Holefish from the first game, but they serve a mechanical purpose. They aren't predators. In fact, if you’re running low on O2, you can swim into the hole in the center of their body to catch a breath of oxygen trapped in their membrane. It’s a symbiotic relationship that feels very "Subnautica." You'll see them mostly in the West Arctic and the Thermal Spires, often being harassed by smaller predators. They're big, sure, but they’re low on the threat ladder.
Chelicerate: The New Face of Terror
If the Reaper was the mascot of the first game, the Chelicerate is the heavy hitter here. It looks like a giant, mutated shrimp from hell. It has these four massive mandibles that it uses to pin your Seatruck in place while it screams in your face.
You’re going to run into these guys in the Purple Vents and the East Arctic. They are territorial as get-out. The "regular" Chelicerate is bad enough, but there’s a more terrifying version: the Void Chelicerate.
Go too far.
If you swim past the map’s edge into the "Void" or the World Edge, three of these translucent, white-and-red monsters will spawn to herd you back—or just kill you. They are significantly larger than the standard ones. They represent the game’s "soft" border, and honestly, seeing one materialize out of the pitch-black water of the dead zone is one of the most stressful experiences in modern gaming.
The Shadow Leviathan: Subnautica's Darkest Nightmare
We have to talk about the Shadow Leviathan. This thing is pure nightmare fuel.
It lives in the Crystal Caves and the Fabricator Caverns. It’s long, serpent-like, and pitch black with a glowing blue underside. Unlike the Chelicerate, which feels like a wild animal, the Shadow Leviathan feels... malicious. It has a mouth on its underside that it uses to latch onto your Seatruck, and it will literally try to melt you with acidic saliva.
The sound design here is incredible. You’ll hear it clicking and screeching in the distance, and because the Crystal Caves are so cramped, you often can't see it until it's right on your bumper. Most players end up using the Seatruck Perimeter Defense Upgrade just to stand a chance. Without it, you’re basically just a snack in a tin can. It’s easily the most dangerous of all leviathans in Subnautica Below Zero because you have to go through its territory to finish the story. There's no avoiding it.
Ice Worms: The Land Threat
Subnautica isn't just about the water anymore. Below Zero introduces the Ice Worm, a massive leviathan that lives under the ice in the Arctic Spires.
This thing is huge. It senses vibrations. If you’re humming along on your Snowfox (the hoverbike), you’re basically ringing a dinner bell. The Ice Worm will burst through the ground, knock you flying, and then disappear back into the ice before you can even get your bearings.
It's a different kind of fear. In the water, you have 360 degrees of movement. On the ice, you’re stuck on a 2D plane, and the threat is coming from beneath your feet. A lot of players find the Ice Worm annoying, but if you look at the lore, it’s a fascinating apex predator that has adapted to the frozen wasteland. It uses superheated armor on its head to melt through the ice instantly.
The Frozen Leviathan: A Glimpse Into the Past
Finally, there’s the Frozen Leviathan. You can't fight this one. It's dead.
Tucked away in a cave at the Phi Excavation Site, this creature is a massive, land-dwelling leviathan that was infected by the Kharaa bacterium. It’s a huge part of the game’s narrative. When you first find it, the scale is just staggering. It makes the other leviathans look like goldfish. It’s a grim reminder of what the Precursors (the Architects) were dealing with before everything went to hell on this planet.
Tips For Surviving These Encounters
Surviving all leviathans in Subnautica Below Zero isn't about being the strongest; it's about being the smartest.
- Get the Perimeter Defense Upgrade. Seriously. It’s the single most important item for your Seatruck. A quick shock will make a Chelicerate or Shadow Leviathan let go immediately.
- Turn off the lights. If you see a predator in the distance, turn off your Seatruck lights. It makes you slightly harder to detect.
- Carry a Repair Tool. Always. If you get grabbed, you’re going to take 20-40% damage. You need to be able to fix your ride the moment you're safe.
- Use Thumpers on land. For the Ice Worms, Thumpers are a lifesaver. They create a distraction that keeps the worm busy while you scoot across the ice.
The leviathans in Below Zero might be fewer in number than the original game, but they are more integrated into the path you have to take. You can't just avoid the "scary biomes" if you want to see the end of Robin Ayou's story. You have to face them.
Actionable Next Steps:
- Priority 1: Craft the Seatruck Perimeter Defense Upgrade using 1x Polyaniline and 1x Wiring Kit at a Fabricator. This is your "get out of jail free" card for the Crystal Caves.
- Priority 2: Locate the Phi Excavation Site early. The lore surrounding the Frozen Leviathan provides context that makes the rest of the game’s threats feel much more grounded in the world's history.
- Priority 3: When entering the Purple Vents, hug the seafloor. The Chelicerate usually patrols the mid-to-upper water columns, so staying low can help you slip by unnoticed.