There are thousands of survival games on the market, but one aquatic addition stands above the rest. Subnautica is a water-based survival game that pits players against the dangers of planet 4546B. The game's unique elements and story have granted it worldwide fame and admiration. Every aspect of Subnautica is amazing, but by far the most impressive are its creatures.

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From the big-eyed peeper to the peculiar Crasquid, there is no creature lacking in creativity. While each creature is astounding the most awe-inspiring is the Leviathan Class Organisms. Every one of these creatures is massive with some the size of buses and others the size of skyscrapers. While every Leviathan is huge fans would undoubtedly be surprised at how they compare.

Updated October 20, 2021, by Christopher Anaya: Subnautica's most peculiar creatures, the Leviathans, garner much interest from fans. The mystery revolving around these monstrous beings and their place in the world leaves many perplexed. So, it is only fitting for fans to understand what is known of these wondrous — and sometimes terrifying — beasts. Thus, general information regarding each creature has been included to better inform curious fans. Everything from a leviathan's disposition towards explorers to their locations is listed below. Take time to internalize this information and utilize it when encountering these legendary creatures.

14 Sea Treader (20 Meters)

The Sea Treader Leviathan
  • Attitude: Defensive
  • Health: 3000
  • Damage: Kick – 40; Stomp – 40
  • Locations: Grand Reef, Sea Treader's Path, Sea Treader's Tunnels Caves

The Sea Treader Leviathan is notably unique compared to other creatures of its classification. While other members of its category swim or burrow, the Sea Treader walks. Using its two legs and elongated mouth — commonly mistaken for a third leg — it marches across the barren ocean floor. With each powerful step, the Sea Treader uproots ore from the ground for players to collect.

The Sea Treader is the smallest Leviathan known so far, but still measures 20 meters in size, which is considerably large. This bottom-dwelling Leviathan is nearly double the size of a bus. Even juvenile Sea Treaders are towering compared to humans. However, when in line with other Leviathans, the Sea Treader becomes far less imposing.

How To Deal With Sea Treaders

Sea Treaders are not aggressive; however, they will attack anything that approaches their herd. Using their powerful legs, they can easily bludgeon a careless diver to death. Thus, it is best to stay away from a Sea Treader's path. If players are looking to collect uprooted ore, they should wait for these beasts to cross first.

13 Glow Whale (30 Meters)

The Glow Whale Leviathan
  • Attitude: Passive
  • Health: 10,000
  • Damage: None
  • Locations: East Arctic, Lilypad Islands

The Glow Whale Leviathan exemplifies planet 4546B's wondrous icy ecosystem. Every aspect, from its bioluminescent properties to its harmonious sounds, inspires amazement. Witnessing Glow Whales breach the surface or consume schools of fish is astonishing, but players can take it one step further. These majestic creatures will allow players to pet or even ride them for a period.

The Glow Whale is the smallest Leviathan in Subnautica: Below Zero and the thirteenth biggest overall. It is 30 meters in length and considerably broad in size. This fantastical Leviathan is slightly bigger than a basketball court. The Glow Whales massive body even supports barnacles and vegetation. Despite this compared to other Leviathans the Glow Whale is lackluster in size.

How To Deal With Glow Whales

Glow Whales are passive creatures that lack any defensive capabilities. Thus, there is no real need to fear or avoid these magnificent leviathans. One should take any opportunity to embrace these great beasts and even hitch a ride on their backs.

12 Chelicerate (40 Meters)

The Chelicerate Leviathan
  • Attitude: Aggressive
  • Health: 5000
  • Damage: 75 (Player); 15-30 (Seatruck); 21-33 (Prawn Suit)
  • Locations: East Arctic, Purple Vents, Tree Spires

The Chelicerate Leviathan is only a sample of what 4546B's icy waters have to offer and it is horrifying. At first, it is deceptively unimpressive but upon getting closer players will be met with true terror. When attacking, the Chelicerate's jaw will split into four mandibles able to grip and swallow prey.

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The Chelicerate is the smallest aggressive Leviathan of the series, and the twelfth largest of its kind. It is a size of 40 meters with its head making up a third of its length. This petrifying Leviathan is around the size of a smaller commercial airplane. Even with its void counterpart, the Chelicerate remains among the less impressive sized Leviathans.

How To Deal With Chelicerates

Chelicerates are aggressive creatures that are highly territorial, relentlessly pursuing anything that encroaches on their turf. So, it is understandably difficult to avoid or even escape these unyielding leviathans. The best way to deal with Chelicerates is to travel through crevices or maximize one's speed. Otherwise, all players can do is hope that a Chelicerate does not notice them.

11 Reaper Leviathan (55 Meters)

The Reaper Leviathan
  • Attitude: Aggressive
  • Health: 5000
  • Damage: 80 (Player); 220 (Cyclops); 40-60 (Seamoth); 20-30 (Prawn Suit)
  • Locations: Crash Zone, Dunes, Mountains

The Reaper Leviathan remains one of the most notorious Leviathans in the franchise. This harrowing creature acts as a reminder for players to always be cautious when exploring 4546B's sea. Those unfortunate or careless enough to encounter the Reaper Leviathan will face the might of 4546B's infamous killer.

The Reaper Leviathan is the smallest aggressive Leviathan in Subnautica and the eleventh largest of its class, at 55 meters of pure muscle and murderous intent. This malicious creature is the size of the famous Leaning Tower of Piza, large enough to crush vehicles with relative ease. It is one of the deadliest Leviathans, but far from being one of the largest.

How To Deal With Reaper Leviathans

Reaper Leviathans are aggressive creatures that attack with overwhelming ferocity. Thus, avoiding them is a priority, lest players are crushed by their powerful mandibles. A surefire way to avoid Reaper Leviathans is to stick close to the ocean's surface, away from the deeper waters in which they lurk. Should players encounter this leviathan, it is best to move in a winding pattern.

10 Shadow Leviathan (60 Meters)

The Shadow Leviathan
  • Attitude: Aggressive
  • Health: 5000
  • Damage: 75 (Player); 20-35 (Seatruck); 33-42 (Prawn Suit)
  • Locations: Crystal Caves, Fabricator Caverns

The Shadow Leviathan is among the series' most harrowing creatures. Every feature is meant to induce terror in players. The Shadow Leviathan's slender black body and sharp protrusions are frightening enough, but its mouth is nightmarish. Located on the underside of its body is a glowing ribcage-like mouth.

The Shadow Leviathan is the second-largest aggressive Leviathan of Subnautica: Below Zero and the tenth-largest overall, at 60 meters in length. This horrific Leviathan is the size of a lower-end soccer field, big enough to grab the Seatruck and even swallow it whole. It is one of the most terrifying Leviathans, but also on the smaller end.

How To Deal With Shadow Leviathans

Shadow Leviathans are vicious creatures that prey on other leviathans and players unfortunate enough to be caught in their grasp. Their spectral mouth is capable of crushing and swallowing nearly anything, making them a significant threat. The preferred strategy for avoiding Shadow Leviathans is to stick to the ocean's recesses, where it cannot reach.

9 Reefback Leviathan (70 Meters)

The Reefback Leviathan
  • Attitude: Passive
  • Health: 10,000
  • Damage: None
  • Locations: Bulb Zone, Crag Field, Dunes, Grassy Plateaus, Mushroom Forest, Sparse Reef, Underwater Islands

The Reefback Leviathans are among the most beloved creatures in the series. Their peaceful demeanor and great size make them one of Subnautica's greatest wonders. Even seasoned players cannot pass pods of Reefback Leviathans without admiring their majesty. In addition to their astounding presence, the Reefback Leviathans hold a mini-ecosystem on their shell.

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The Reefback Leviathan is the largest passive Leviathan in Subnautica and the ninth-largest of its class. It is a stocky creature that is 70 meters in length, the size of the world's largest cargo plane. Adult Reefback Leviathans have no predators due to their massive size. Despite its amazing size, it is among the smaller Leviathans.

How To Deal With Reefback Leviathans

Reefback Leviathans are not only gentle giants, but an excellent source of material as well. Although they lack any offensive capabilities, Tiger Plants often seek refuge on their backs. This hostile flora can easily kill an unsuspecting player. Thus, it is best to observe from afar, and dispatch any Tiger Plants quickly with a Survival Knife or Thermoblade.

8 Ice Worm (95 Meters)

Ice Worm Leviathan

  • Attitude: Aggressive
  • Health: Unkillable
  • Damage: Unknown; can instantly kill players and heavily damage the Snowfox
  • Locations: Arctic Spires

The Ice Worm Leviathan is the only member of its class to be entirely land-based. This massive creature burrows through the freezing ice shelves of 4546B. The Ice Worm uses its super-heated horn to drill through the planet’s ice near effortlessly. Using this ability, it can ambush prey above the ice within seconds. The only way to evade the Ice Worm is by using a Thumper, which will temporarily distract it.

The Ice Worm is the largest aggressive Leviathan in Subnautica: Below Zero and the eighth largest of its kind. At 95 meters in length, this subterranean Leviathan is about the size of the famous Big Ben Clocktower. Its burrows are large enough to allow the Prawn Suit through with ease. The Ice Worm is among the bigger Leviathans, but it is still dwarfed by some.

How To Deal With Ice Worms

Ice Worms are very aggressive, with incomparable ferocity and impenetrable defenses, making it a difficult beast to counter. However, that is not to say that it is impossible. The best way to deal with Ice Worms is to rely on a device colloquially known as a Thumper. This tool will draw the leviathan's attention, providing players ample time to escape or at least get a running start.

7 Ghost Leviathan (107 Meters)

The Ghost Leviathan
  • Attitude: Aggressive
  • Health: 8000
  • Damage: 84 (Player); 42 (Seamoth); 14 (Prawn Suit); 250 (Cyclops)
  • Locations: Crater Edge, Grand Reef, Northern Blood Kelp Zone

The Ghost Leviathan is often regarded as one of the most terrifying Leviathans. Its translucent and luminous appearance makes it a supernatural-like creature of 4546B's seas. Its skin alone is scary, but what lies beneath is much worse. Upon close observation, players will note that the Ghost Leviathan has a formidable musculature underneath.

The Ghost Leviathan is the third-largest aggressive Leviathan and the seventh biggest overall. Its clear and slender body is 107 meters in length, nearly the size of a football field. It can easily destroy the submarine, making it a considerable threat. The Ghost Leviathan is one of the larger members of its class, but it is far from the biggest.

How To Deal With Ghost Leviathans

Ghost Leviathans are just as petrifying and dangerous as their name suggests. They are aggressive and can easily damage, overturn, and destroy the most formidable vehicles. Fortunately, Ghost Leviathans take time to charge an attack and often swim away afterward. The best method is to move out of their attack path within moments of contact, evading their assault and granting time to flee.

6 Ventgarden (110 Meters)

The Ventgarden Leviathan
  • Attitude: Passive
  • Health: None
  • Damage: None
  • Locations: Tree Spires

The Ventgarden Leviathan is a remarkable example of symbiosis on planet 4546B. It cooperates with 4546B's plant life to survive off a thermal vent alone. The Ventgarden's transparent bell functions as a shelter for flora from herbivores. In turn, the plants help the Leviathan absorb various metals and gases released from the thermal vent.

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The Ventgarden is the largest passive Leviathan of the franchise and the sixth biggest of its class, towering at a height of 110 meters. This plant nursery-like Leviathan is only slightly bigger than the Ghost Leviathan, and is large enough for players to enter it and explore.

5 Sea Dragon (112 Meters)

The Sea Dragon Leviathan
  • Attitude: Aggressive​​​​​​
  • Health: 5000
  • Damage:
    • Bite: Instant Kill (Player); 10-20 (Prawn Suit). Swat - 40 (Player); 11 (Prawn Suit); 250 (Cyclops)
    • Fire Breath: 12-72 (Player); 3-19 (Prawn Suit); 500 (Cyclops)
  • Locations: Inactive Lava Zone, Lava Lakes

The Sea Dragon Leviathan among the most devastating creatures in Subnautica, second only to the Sea Emperor. The ability to destroy precursor facilities and shoot fireballs makes this Leviathan a catastrophic force. The Sea Dragon is large and powerful enough to hunt the seemingly insurmountable Reaper Leviathans for food.

The Sea Dragon is the second largest aggressive Leviathan and the fifth-biggest overall. When fully grown it can reach a length of 112 meters, allowing it to deal with any threat including the player and their vehicles. The Sea Dragon is one of the biggest Leviathans, but not among the top three.

How To Deal With Sea Dragons

Sea Dragons are among the most renowned and dangerous of the franchise. They boast unique abilities unlike any other leviathan, making them a significant threat. Understandably, they are difficult to avoid, as they possess both close and far ranged attacks. The best way to deal with them is to keep close to small spaces and be cautious of oncoming fireballs.

4 Frozen Leviathan (150 Meters)

The Frozen Leviathan
  • Attitude: Aggressive
  • Health: Unknown
  • Damage: Unknown
  • Locations: Glacial Basin

The Frozen Leviathan is an unidentified extinct creature frozen in 4546B's icy waters. This enormous creature fell into the ice over a thousand years ago and is presumed to be dead. While it has been studied intensively by Alterra, not much is known about the Frozen Leviathan. However, it is certainly one of 4546B's largest creatures to ever live.

The Frozen Leviathan is the third-largest extinct Leviathan and the fourth biggest overall. Its body alone is 70 meters, but including its tail, it is 150, making the Frozen Leviathan bigger than the Great Pyramid of Giza. The Frozen Leviathan's species is presumed extinct due to the current unsuitable environment of the planet's sea.

3 Sea Emperor (200 Meters)

The Sea Emperor Leviathan
  • Attitude: Passive
  • Health: None
  • Damage: None
  • Locations: Primary Containment Facility Aquarium

The Sea Emperor is a near-extinct species of Leviathans. The Kharaa bacterium killed off the Sea Emperor's food source, resulting in the death of almost every one of its species. Due to its immunity to the Kharaa infection, the last known Sea Emperor was captured by the Precursors in hopes to find a cure. In Subnautica, players can interact with the Sea Emperor and help it hatch its eggs.

The Sea Emperor is the largest living Leviathan seen on planet 4546B, but the third biggest overall. It is a colossal beast that is 200 meters in length. The Sea Emperor's massive size easily dwarfs any living creature on 4546B. However, the planet's oceans no longer support titanic organisms such as the Sea Emperor, making its species' survival unlikely.

2 Ancient Skeleton (Unknown)

The Ancient Skeleton Leviathan
  • Attitude: Unknown
  • Health: Unknown
  • Damage: Unknown
  • Locations: Lost River

The Ancient Skeleton is among the few extinct creatures known on planet 4546B. This armored Leviathan's skeleton was of much interest to the Precursors. Many details are unknown to the player, including why it was being studied. Despite this, it is possibly one of the biggest creatures to have ever existed on planet 4546B.

The Ancient Skeleton's placing is uncertain, but it is at least bigger than the Sea Emperor. Its skeleton reveals 95 meters of its body however it is projected to be much bigger. The Ancient Skeleton is predicted to be larger than any living creature currently on 4546B. While its size is undetermined there is no chance that it is bigger than the largest Leviathan ever known.

1 Gargantuan Fossil Leviathan (1100-1500 Meters)

The Gargantuan Fossil Leviathan
  • Attitude: Unknown
  • Health: Unknown
  • Damage: Unknown
  • Locations: Lost River Bone Fields, Lost River Ghost Forest

The Gargantuan Fossil is the largest of the extinct Leviathans seen on planet 4546B. Not much is known about it, making it a target of Precursor study and the player's interest. However, the only information gathered on the Gargantuan Fossil is that it was eel-like and that the area around it shifted. One certainty is that it is the largest known Leviathan to have ever existed on planet 4546B.

The Gargantuan Fossil's head alone easily surpasses the size of 7 Leviathans. In total, this enormous creature is anywhere from 1100 to 1500 meters in length. To put it in perspective, the Gargantuan Fossil is 672 meters bigger than the world's tallest building. It is unlikely that any other creature to have existed on 4546B is larger than the Gargantuan Fossil — which is probably for the best.

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