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Blue alert (also code blue or condition blue) was an alert signal status on Starfleet vessels and outposts which was called for in exceptional situations, including, but not limited to, environmental hazards to the crew, main power failure, docking and separation maneuvers, and landing protocols, for ships with the capability.
In 2367, the event of an imminent environmental systems failure or disruption resulted in blue alert being called in the affected areas in order to help affected personnel escape or safeguard their lives. (TNG: "Brothers")
On a vessel with landing capabilities, such as the Intrepid-class, blue alert was called as an indication that the ship was preparing either to land or to take off; the crew would then need to report to code blue stations, in order to aid in the landing/liftoff procedures. (VOY: "The 37's", "Demon") Blue alert was the minimum required ship status for landing an Intrepid-class starship, as the USS Voyager did make a landing while at red alert without switching to blue alert status. (VOY: "Dragon's Teeth")
|Colored alerts:||Red • Double Red • Yellow • Blue • Gray|
|General alerts:||Battle stations • "Brace for impact" • General quarters|
|Battle • Evacuation • Fire • Intruder • Perimeter • Proximity • Security • Standby • Tactical|