The maintenance units are Luminoth devices used to perform routine tasks within Sanctuary Fortress. While it is unknown whether or not they went rogue, it is known that they have been in service for a relatively long time by the time Samus encountered them. In Central Area Transport West, these units demonstrate invisibility and the ability to emit sonic transmissions. Similar to birds, they can be shot and destroyed, although this provides no benefit beyond amusement.
The perpetually hovering Luminoth maintenance unit is simple in design, with a grey, dome-shaped body that can split into three segments, revealing a light red core. It features three spindly, multijointed appendages underneath. Maintenance units will occasionally utter mechanical tones as they fly to their next destination.
"Object analysis complete. This is a simple maintenance unit. Programmed to perform routine tasks, the unit functions well despite several decacycles of service."
|Space Pirates|| Aqua • Cloaked • Crawltank • Goliath-class heavy assault • "Jolly Roger" • Phazon Harvester • Pirate Cargo |
Pirate Surveillance • Sentry
|Galactic Federation||Galactic Federation Reconnaissance • Training • AI Combat|
|Chozo||Class D Transportation • "Dragoon" Battle • Defense • Elysian Shriekbat • Hive Mecha • Incinerator • Repair (Aerial)|
|Luminoth|| Caretaker Class • Diligence Class (Dark Diligence) • Harmony-Class • Ingsmasher • Lightflyer • Maintenance unit • Quad • Quadraxis |
Serenity Class • Watchdrone