Easter Eggs

Easter eggs are hidden references to other games or pop culture.

Natural Selection 2

The Natural Selection 2 Poster

The Natural Selection 2 Poster can be found inside the Wreck in the Grassy Plateaus and placed inside your Seabase. It is a reference to another game made by Unknown Worlds.

Portal 2

The first message broadcasted from the Communications Relay, which says: "This is an automated bounce back from the Aurora Mining Vessel. Your distress signal has been received. An emergency relief team will be dispatched to your location. *Static* Estimated arrival time: 9...9...9...9...9 hours". The wait time is a possible reference to Portal 2, whereas the announcer says to Chell (the protagonist): "You have been in suspension for nine...nine...nine...nine...nine..."

Holy Diver

A fifth message is received by the player's Communications Relay later in the game. The day this message is received varies. It displays: You've been down too long in the midnight sea. Oh don't you see what I mean? This message is a reference to the song Holy Diver by the US heavy metal band DIO.

Rimworld

The planet's moon bears resemblance to the moon from Rimworld, it can be noted that both moons are similar in appearance.

A comparison of Subnautica's moon and Rimworld's moon

Charlie and the Chocolate Factory

The Violet Beauregarde  is a reference to the character Violet Beauregarde from the movie Charlie and the Chocolate Factory.