The Sea Dragon Leviathan is a colossal leviathan class fauna species. It is the largest aggressive creature of Subnautica. There are a total of three Sea Dragon Leviathans on the map: two in the Inactive Lava Zone and one in the Lava Lakes.


The Sea Dragon Leviathan's body mostly resembles the Sea Emperor Leviathan, albeit much smaller and slimmer in design. The body is mostly dark green in color, along with purple accents on its webbed limbs and head. It has protective plates on the underside of its body that start at the neck and run down to where the tentacles begin. Many of its body parts are adorned or spotted with orange bioluminescent glows, and many small spines line its lower jaw and arms.

The head of the Sea Dragon is stout and reptilian, possessing two pairs of glowing orange eyes with white pupils, a crack-like pattern spreads from the pupils to the rest of the eye. The mouth contains a pink tongue and thirty-two large teeth, visible even when the mouth is closed. The tip of the snout features two short, green protrusions with orange glowing tips. It also has a second set of larger fin-like protrusions beneath its lower jaw. Along the side of its body runs two long trails of small hollows that emit orange bioluminescent glows. It has two long forearms ending with webbed, four digited hands; each digit ends with a claw that is approximately equal in size to the player's entire body. A large sail sits on the creature's back, just below the shoulders. Its rear-side consists of seven tentacles, also lined with orange spots and ending with small tentacular clubs, the largest tentacle being surrounded by the six smaller ones.


The Sea Dragon Leviathan uses its arms and tentacles to swim in the water at great speed; according to the "Damaged Anchor Cable" entry from the Disease Research Facility, it is capable of exerting over 300 tons of force by ramming. Just being in close proximity to the Sea Dragon Leviathan will cause the player or Prawn Suit to be jostled due to the water it displaces. It will attack the player with its arms if they are on either side of its front body by swatting them away and dealing 40 damage to the player. If the Sea Dragon Leviathan attacks the player with its mouth, it will swallow the player, killing them instantly. Occasionally, the Sea Dragon Leviathan will open its mouth wide and fire a molten rock at its target as a projectile attack. The Sea Dragon Leviathan is also capable of firing a barrage of small "fireballs" covering a wide area.

The Sea Dragon Leviathan will attack the Cyclops by slamming it with its arms with considerable force, often leaving the Cyclops upside down or on its side.

The Sea Dragon Leviathan can deal massive damage to a Prawn Suit very quickly; the swat attack does 13% damage to the suit, the Sea Dragon Leviathan also has the ability to grab the vehicle in its mouth and deal 10-20% damage before releasing it; it often swats immediately after. The meteor attack can do between 24% and 48% damage to the vehicle and a sustained barrage of small fireballs can deal devastating damage to the Prawn.

When the Sea Dragon Leviathan is exposed to damage, it will flinch and commonly, if the Player is close, it will swat them away dealing large amounts of damage to the Player if they aren't in any Vehicles.

The Sea Dragon Leviathan will get stuck inside the walls of the map, but still be able to attack the player.

Similar to the Lava Lizard, the Sea Dragon is resistant to the Thermoblade


Spoiler alert: The following section contains story related material.

A little under a thousand years ago, a Sea Dragon Leviathan Egg was taken by the Precursors and contained within the Disease Research Facility for testing, however, the parent Sea Dragon pursued the Precursors back to the facility and destroyed it, resulting in the Kharaa Bacterium being released onto Planet 4546B, causing the Precursors to put the planet into quarantine.

The skeleton of this Sea Dragon Leviathan can be found near the Disease Research Facility, having suffered massive head trauma from the attack.


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Data Bank Entry

Sea Dragon Data Bank Entry.png

A colossal leviathan with reptilian features, seen stalking the very heart of the volcanic crater which underpins life in this area. The scanned specimen measured 112m in length.

1. Heat-Proof Tissue:
Tissue analysis reveals this specimen consists of 1/3 inanimate materials, focused around the chest area. Consumption and retention of mineral substances may explain the lifeform's ability to withstand extremes of temperature. It even appears to be able to consume molten materials and expel them at its adversaries.

2. Forearms:
Evolutionarily distinct forearms are used for both propulsion and offensive purposes. Finding suggests evolutionary divergence from other species on the planet tens of millions of years ago. The sea dragon is likely one of the oldest species on the planet.

3. Behavior:
As the largest carnivorous species encountered on 4546B, almost everything is potential prey. With few substantial targets in the volcanic cave systems the sea dragon likely ventures out into cooler waters to hunt other, smaller leviathans, cornering them and forcing them deeper, where they are ultimately boiled alive.

The sea dragons' size and the restrictions of the cave systems they inhabit suggest their population numbers are extremely low, perhaps in the single digits. While it is not unusual for larger predators to sustain lower populations, it is possible the sea dragon's food sources have diminished over time. This species may be nearing extinction.

Assessment: Extreme threat - Avoid in all circumstances



  • The sounds of the Sea Dragon Leviathan were created by combining real sounds from a bull, an elephant, and a tiger.
  • The Sea Dragon Leviathan was originally larger than it is currently, the downsizing being due to a bug that was ignored for several months. The developers ultimately decided to leave it at its incorrect scale since no one remembered its original size, and also because it already had problems navigating terrain. [1]
  • The Sea Dragon Leviathan used to be able to attack the Seamoth, but due to the developers figuring out that the Seamoth couldn't go that deep, they removed it.
  • It is possible that the appearance of the Sea Dragon Leviathan was inspired by this description of a creature called Leviathan in the Bible:
    • Job 41:13-25 "Who can strip off its outer coat? Who can penetrate its double coat of armor? Who dares open the doors of its mouth, ringed about with fearsome teeth? Its back has rows of shields tightly sealed together; each is so close to the next that no air can pass between. They are joined fast to one another they cling together and cannot be parted. Its snorting throws out flashes of light; its eyes are like the rays of dawn. Flames stream from its mouth; sparks of fire shoot out. Smoke pours from its nostrils as from a boiling pot over burning reeds. Its breath sets coals ablaze and flames dart from its mouth. Strength resides in its neck; dismay goes before it. The folds of its flesh are tightly joined; they are firm and immovable. Its chest is hard as rock, hard as a lower millstone. When it rises up, the mighty are terrified; they retreat before its thrashing."[2]
      • The Sea Dragon has many features that match this description. First, "its back has rows of shields." Upon examination of a Sea Dragon Leviathan Skeleton, it can be seen that the back is composed of five closely linked plates resembling shields. Second, "its eyes are like the rays of dawn" the eyes of a Sea Dragon do give off the impression of rays of light, matching this description. Next, "flames dart from its mouth"; the Sea Dragon is well known for its "fire breathing" ability, in line with the biblical Leviathan. Finally, "its chest is as hard as rock." The Sea Dragon's chest is composed of hard, grey plates that, unlike the dorsal plates, can be seen on the outside of the body. These ventral plates have a rock-like appearance. The data bank entry also notes a large amount of inorganic materials in the chest region, hinting at the rock-hard chest of the Biblical Leviathan.


  2. The Bible, Job 41:13–25
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