Eggs

Eggs are items found in Subnautica and Subnautica: Below Zero. They are the unhatched versions of their respective Fauna. Until they hatch, an egg is labeled as an unknown creature egg, changing to match the name of the creature the egg contained if it hatches inside an Alien Containment. The PDA gives the player this information instantly no matter where they are, without needing to be present to observe which creature came from which egg. After learning this information this way in-game, or from the table below, similar eggs can be identified by the biome it comes from, its appearance, and size.

Almost all eggs can be placed inside an Alien Containment. After placing an egg inside an Alien Containment, it will stay where it was placed. After one to three in-game days, the egg will hatch into a smaller version of its respective species. The hatched creature will slowly grow until it is moderately-sized or can fit within the confines of the Alien Containment. They can die inside of the aquarium, however, if the aquarium's population limit is surpassed.

Baby creatures can be picked up and placed outside in the water, where they will instantly become fully grown. Most normally aggressive creatures will not attack the player if hatched in the Alien Containment, allowing the player to scan it even after it is released in the wild. The exceptions are the Ampeel and the Eye Jelly, as their electric shocks still apply damage, as well as the Crabsquid.

Eggs can be destroyed. Hits with a knife will slice open the egg, resulting in no creature being spawned. Crashfish explosions can destroy their own eggs and habitat if they are too close. They are destroyed by a Prawn Suit with a punch, so picking them up with the Prawn is risky. Using a Propulsion or Repulsion Cannon on it also destroy them, meaning they can only be picked up by hand or a careful Prawn operator.

Eggs can be found in their species' biomes, but gravity can cause an egg to roll or fall into another biome or cave. An example of this is finding a Stalker egg in the Jellyshroom Cave.

Eggs can be used as fuel for the Bioreactor, though they provide far less energy than a hatched creature.

Subnautica Normal Eggs

Size	Description	Location	Energy Value	Item ID
4 (2×2)	Ampeels hatch from these.	Blood Kelp Zone, Bulb Zone	259	shockeregg
4 (2×2)	Bonesharks hatch from these.	Bulb Zone, Mushroom Forest, Underwater Islands	210	bonesharkegg
4 (2×2)	Crabsnakes hatch from these.	Jellyshroom Cave, inside Jellyshroom	231	crabsnakeegg
4 (2×2)	Crabsquid hatch from these.	Deep Grand Reef, Northern Blood Kelp Zone	259	crabsquidegg
1 (1x1)	Crashfish hatch from these.	Kelp Forest Caves, Safe Shallows, Safe Shallows Caves	189	crashegg
1 (1x1)	Cuddlefish hatch from these.	Deep Grand Reef Degasi Base, Dunes Sinkhole, Lost River Laboratory, Northeastern Mushroom Forest Caves, Northwestern Mushroom Forest Caves	210	cutefishegg
4 (2×2)	Gasopods hatch from these.	Crash Zone Mesas, Dunes, Safe Shallows	231	gasopodegg
4 (2×2)	Jellyrays hatch from these.	Deep Grand Reef, Mushroom Forest, Mushroom Forest Caves	119	jellyrayegg
4 (2×2)	Lava Lizards hatch from these.	Lava Castle, Lava Lakes	189	lavalizardegg
1 (1x1)	Mesmers hatch from these.	Bulb Zone, Bulb Zone Caves, Lost River, Bone Fields	175	merecegg
1 (1x1)	Rabbit Rays hatch from these.	Safe Shallows	140	rabbitrayegg
4 (2×2)	Sand sharks hatch from these.	Grassy Plateaus	210	sandsharkegg
1 (1x1)	Spadefish hatch from these.	Deep Sparse Reef, Grand Reef, Grassy Plateaus Caves, Underwater Islands, Underwater Islands Caves	140	spadefishegg
4 (2×2)	Stalkers hatch from these.	Kelp Forest	105	stalkeregg

Unique Eggs

Spoiler alert: The following section contains story related material. These eggs are unobtainable.

Egg	Details	Location
	Sea Dragon Leviathan Egg<br>An egg found in a specimen case within the Disease Research Facility, this egg was taken by the Precursors one thousand years ago to help research ways to make the Sea Emperor Leviathan eggs hatch. This egg cannot be hatched.<br><br>Two more Sea Dragon Leviathan eggs can be found in the egg lab of the Primary Containment Facility, strangely, these eggs are far smaller than the egg found in the Disease Research Facility.	Disease Research Facility<br>Primary Containment Facility Egg Lab
	Sea Emperor Leviathan Egg<br>Six of the eggs laid by the captive Sea Emperor Leviathan in the Sea Emperor's Aquarium. These eggs must be hatched in the story. One of the eggs was taken and forcefully cut open in hope of learning about the hatching response the eggs needed. It can be found upstairs in the Primary Containment Facility along with the dead fetus from the egg on a research table.	Primary Containment Facility
	Ghost Leviathan Egg<br>The eggs of the Ghost Leviathan, which were placed down when the Giant Cove Tree was an infant, and now it has grown around the eggs and formed a natural protection over the eggs, awaiting them to hatch. These eggs cannot hatch in-game.	Lost River<br>Tree Cove

Below Zero Eggs

Egg	Size	Description	Location	Energy Value (Per Slot)	Incubation Period (Days)	Item ID
Arctic Ray Egg	1	Arctic rays hatch from these.	Sparse Arctic	189	1	arcticrayegg
Brinewing Egg	1	Brinewings hatch from these.	Sparse Arctic	105	1	brinewingegg
Brute Shark Egg	2	Brute Sharks hatch from these.	Twisty Bridges Caves	231	1.5	brutesharkegg
Crashfish Egg	1	Crashfish hatch from these.	Arctic Kelp Caves, Crystal Caves, Crystal Castle, Purple Vents, Twisty Bridges Caves	189	1	crashegg
Cryptosuchus Egg	2	Cryptosuchus hatch from these.	Thermal Spires Caves	259	2	cryptosuchusegg
Glow Whale Egg	3	Glow Whales hatch from these.	Lilypad Islands, Lilypad Islands Caves, Main Lilypad Islands	280	2	glowwhaleegg
Eye Jelly Egg	1x2	Eye Jelly hatch from these.	Glacial Connection	119	1	jellyfishegg
Lily Paddler Egg	1	Lily paddlers hatch from these.	Lilypads Crevice	231	1	lilypaddleregg
Pengwing Egg	1	Pengwings hatch from these.	Arctic Kelp Forest, East Arctic, West Arctic	119	1	penguinegg
Pinnacarid Egg	1	Pinnacarids hatch from these.	Arctic Kelp Forest	189	1	pinnacaridegg
Rock Puncher Egg	2	Rock punchers hatch from these.	Crystal Caves, Crystal Caves Fissure, Koppa Mining Site	245	1.5	rockpuncheregg
Sea Monkey Egg	1	Sea Monkeys hatch from these.	Sea Monkey Nests	210	1	seamonkeyegg
Squidshark Egg	2	Squidsharks hatch from these.	Deep Lilypads Cave	259	2	squidsharkegg
Titan Holefish Egg	2	Titan holefish hatch from these.	East Arctic, West Arctic	259	1.5	titanholefishegg
Blue Trivalve Egg	1	Blue Trivalves hatch from these.	Arctic Spires, West Arctic	210	1	trivalveblueegg
Yellow Trivalve Egg	1	Yellow Trivalves hatch from these.	Deep Lilypads Cave	210	1	trivalveyellowegg

Databank Entry

Alien Eggs

Evidence suggests that a substantial number, if not all of the local species reproduce through egg-laying. Eggs can be found resting on the seafloor, buried beneath detritus, or even wedged into cracks in the rock.

Different species likely favor different biomes as their nesting grounds. Eggs discovered in the wild are in some form of natural stasis, likely awaiting ideal conditions in which to hatch, or the delivery of some vital enzyme which will kick start the process.

It is impossible to calculate the species of the egg from the exterior, however it may be possible to stimulate a hatching response if an egg is relocated to a suitable alien containment unit.

Source: Pick up Alien Egg