Eggs are in-development items found in Subnautica. They are the unhatched forms of certain types of Fauna. Until they hatch, the egg will be labeled as an unknown creature egg, changing to match the name of the creature the egg contains once it hatches. An egg can be identified by where it was found, its appearance, and its size (see table below).
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 mildly full sized or can fit to the confines of the Alien Containment. They can die inside of the aquarium however, if the aquarium's population limit is surpassed, or if they are left unattended for too long.
Baby creatures can be picked up and placed outside in the water, where they will instantly become fully grown. An aggressive creature will not attack the player if it is hatched in the aquarium, allowing the player to scan it even after it is released in the wild.
Eggs are also capable of being destroyed before they hatch. 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.
Eggs can be found in their species' respective Biomes, however, due to the game's physics in the game engine, an egg can roll into another biome or cave, an example of this is finding a Stalker egg in the Jelly Shroom Caves.
Eggs can also be used as fuel for the Bioreactor, though they provide far less energy than a hatched creature.
More information and animations can be found on Trello.
|Egg||Size||Description||Location||Incubation Period (Day/s)||Item ID|
|Ampeel egg||4 (2x2)||Ampeels hatch from these.||1||shockeregg|
|Boneshark egg||4 (2x2)||Bonesharks hatch from these.||1||bonesharkegg|
|Crabsnake egg||4 (2x2)||Crabsnakes hatch from these.||1||crabsnakeegg|
|Crabsquid egg||4 (2x2)||Crabsquid hatch from these.||1||crabsquidegg|
|Crashfish egg||1||Crashfish hatch from these.||1||crashegg|
|Cute Fish egg||4 (2x2)||Cute Fish hatch from these.||
|Gasopod egg||4 (2x2)||Gasopods hatch from these.||1||gasopodegg|
|Jellyray egg||4 (2x2)||Jellyrays hatch from these.||1||jellyrayegg|
|Lava Lizard egg||4 (2x2)||Lava Lizards hatch from these.||1||lavalizardegg|
|Mesmer egg||1||Mesmers hatch from these.||
|Rabbit Ray egg||1||Rabbit Rays hatch from these.||1||rabbitrayegg|
|Reefback egg||9 (3x3)||Incredibly, Reefbacks hatch from these.||
|Sand Shark egg||4 (2x2)||Sand sharks hatch from these.||1||sandsharkegg|
|Shuttlebug egg||1||Shuttlebugs hatch from these.||
|Spadefish egg||1||Spadefish hatch from these.||
|Stalker egg||4 (2x2)||Stalkers hatch from these.||1||stalkeregg|
Spoiler alert: The following section contains story related material.