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NPC's and single-player crewmembers are given a random name, chosen from a preset list, while players in multiplayer are able to choose their own name.
Homo sapiens, or known by their common name of human, originate on the planet Earth in the Sol system, the third from Sol itself. Approximately a century into the future, human spacecraft technology has enabled the species to reach Europa, Jupiter's second moon. As is the nature of the human race, colonies and human habitations have begun on the distant moon before all contact with earth was mysteriously lost. Increasing levels of radiation on Europa's icy surface has forced the colonists deep beneath the frozen crust, into the hostile waters below, where countless species of predatory creatures, freezing temperatures and the pressure of the environment itself all conspire against the settlers.
AI-controlled humans will wander around the submarine aimlessly, following the pre-determined waypoints. This behavior will continue until they are either given a task by the player, a machine gets damaged or a hull breaches nearby, or they become injured. If the hull breaches or they run out of oxygen, humans will rush to the nearest Diving Mask or Diving Suit and equip it, along with an Oxygen Tank if one is available. They will continue to wear the suit/mask until the environment regains oxygen, at which point they will drop their items and continue wandering or completing player-given tasks.
In multiplayer, players are able to choose their character's facial appearance. Players are able to switch between female and male faces, while faces in each category are sorted by race.
Each character has a Trait assigned to them. When NPCs chat with each other, traits may change what they say during conversations. For example, a captain with the trait 'Joker' might say, "Welcome on board! Please keep your hands and arms inside the vehicle at all times.", while one with the trait 'Broken English' might say, "Is captain speaking! Ready for mission crew and good luck!"