Blue Alert is a type of alert status with a variety of meanings, varying from starship or outpost to starship or outpost. Also known as Code Blue or Condition Blue, this alert can be used in a variety of situations and launches a variety of Starfleet procedures and protocol: on some ships, it signifies an environmental threat to the crew; on other ships, docking maneuvers; and on yet other ships, it shows landing procedures are under way.

The refit USS Enterprise (NCC-1701) switched to blue alert as it entered Spacedock. (Star Trek III: The Search for Spock)

Code Blue was issued as an alert for "statements to be made by yeomen Burke and Samuel" as part of a ruse to trap Lt Levarus in the Klingon/Federation attempt to undermine the peace treaties between both empires. (Star Trek VI: The Undiscovered Country)

For many ships without landing capabilities, like the Galaxy-class USS Enterprise-D, blue alert signified environmental failure, threatening the lives of the crew. (TNG: "Brothers")

Aboard ships with landing capabilities, such as the Intrepid-class USS Voyager, blue alert meant the ship was landing or taking-off. (VOY: "The 37's")

Some ships, like the Prometheus-class, use blue alert to indicate a separation sequence into multi-vector assault mode. (VOY: "Message in a Bottle") It remains unclear if ships capable of saucer separation like the Galaxy-class also go to blue alert.

Blue alert was declared aboard the USS Defiant when the cloaking device was activated. (DS9: "The Search, Part I")

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