Planetary Defenses represent the automated defensive systems of a given Alpha Base, and are the last line of defense against Raiders. Planetary Defenses can be strengthened by certain Planetary Structs, and weakened when those Structs are destroyed. The stronger the defenses, the longer they take for Raiders to breach.

Planetary Defenses are augmented by an on-station CMD Ship. As long as a CMD Ship is present, Planetary Defenses are secure and cannot be breached. Without the CMD Ship, defenses become vulnerable to hacking attempts by Raiders. When a breach is completed, the battle is over and the victorious Raiders will claim any available Alpha Ore.

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When a CMD Ship is on station, Planetary Defenses are secure and cannot be breached.

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If the CMD Ship is destroyed or away, Planetary Defenses are vulnerable.
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If raiders are present when Planetary Defenses are vulnerable, a breach will automatically begin. A countdown will appear, estimating the time remaining until the breach is successful.

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