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(covers information from several alternate timelines)
A security alert was a type of alert signal aboard starships and space stations, primarily for internal security purposes. It was similar to an intruder alert, and could be initiated explicitly by personnel or triggered by predefined parameters.
In the 23rd century, a security alert aboard Federation starships was part of the general quarters alert, and had at least three levels. (TOS: "The Man Trap", "Dagger of the Mind") By 2285, security alerts of Federation starship systems such as the Constitution-class were separated from the general quarters alert. (Star Trek III: The Search for Spock)
In the 24th century aboard Galaxy-class and Intrepid-class starships, security alerts had at least five levels of application (also referred to as conditions), each one for different types of situations. On certain space stations, security alerts were distinguished by color. A security alert could be activated with no stated degree.
Aboard the USS Voyager, Captain Kathryn Janeway instituted a level 10 security alert after more former Maquis members now part of her crew were subdued by an unknown assailant. The action also confined non-essential personnel to quarters, and the posting of security teams on all decks. (VOY: "Repression")
Aboard the Federation starship USS Enterprise-D, Captain Jean-Luc Picard ordered a level 4 security alert in 2369 after it became apparent that crewmembers were mysteriously disappearing from the vessel. (TNG: "Schisms")
Picard once again instituted a condition 3 security alert and told the computer to shut down all transporter systems and shuttlebays as Wesley Crusher eluded the crew while they were under the influence of the Ktarian game. (TNG: "The Game")
In 2369, Picard ordered a level 2 security alert, after it was learned that a faction of the Borg had changed their entire existence and a new objective. They were no longer interested in acquiring cultures and technology. Armed guards were posted on every deck. (TNG: "Descent")
Chief Miles O'Brien was interrupted while attempting to call a security alert by an alien intruder in Transporter Room Three. Worf expanded the alert to all decks after the intruder left the transporter room. (TNG: "The Bonding")
When Chakotay realized that the translocation by the Nyrians to the USS Voyager was most likely a ploy to take control of the ship, he issued a security alert to all hands, though there were only twelve other crewmen on board at the time. (VOY: "Displaced")
|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|