Easter Eggs

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

Natural Selection 2 Poster
The Natural Selection 2 Poster can be found inside the Wreck in the Grassy Plateaus and placed inside your Seabase.

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.

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 announcer says to Chell: "You have been in suspension for nine...nine...nine...nine...nine..." '

The Propulsion Cannon and Repulsion Cannon could also be refrences to the gels used in the game, Propulsion Gel and Repulsion Gel.