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Trillya

USS Shepard communications officer Trillya transmits a distress call in 2286

Distress signal from USS Honshu

A distress signal is detected

A distress call, distress signal, or disaster call was any signal that requested assistance. It was typically sent by an individual or group that encountered a problem they could not handle on their own. The purpose of the signal was to summon those who could help, such as an assistance party.

A widely known distress signal was "SOS", which dates back to the early 20th century, when broadcast signaling was still a new science. An international convention met to debate and select a "universal" distress call, and "SOS" was selected by most. It did not truly become universal until after the year 1912, when the RMS Titanic, an ancient Earth water-going vessel, sank after striking an iceberg. Her radio operators were forced to send several types of distress signal to ensure the meaning would not be lost.

In 2152, Enterprise NX-01 answered a distress call of an alien vessel according to the captain's starlog. (ENT: "The Catwalk")

In the 23rd and 24th century, starships, starbases, and colonies could emit distress signals which were carried in space or through subspace to anything which could receive it. This could include other ships, bases, and colonies.

In 2254, the USS Enterprise detected an old-style distress signal, a radio wave. (TOS: "The Cage")

In 2257, the USS Discovery received a priority one distress signal just outside the Sol system from the USS Enterprise. (DIS: "Will You Take My Hand?")

In 2259, the USS Cayuga transmitted a distress call before being destroyed by the Gorn at Parnassus Beta. (SNW: "Hegemony")

In 2266, the Enterprise detected an Earth-style SOS while hundreds of light years from Earth. The source was revealed to be a ground station on Miri, an exact copy of Earth. (TOS: "Miri")

In the final draft script of "Miri" but not in the final version of that episode, James T. Kirk and Spock speculated the distress call might be a lure intended to trap them.

Because of tense intergalactic relations, distress signals between races may or may not have received a response. In several cases, a Federation ship crossed into, for example, the Neutral Zone, to answer a distress signal. However, extreme care was taken in these situations, as some enemies would sometimes emit false distress signals to lure starships in and attack them. (TNG: "Suddenly Human")

When passing near Mab-Bu VI in 2368, the USS Enterprise-D received a faint distress signal that Data was later able to identify as a Starfleet subspace distress signal standard to Daedalus-class starships. The signal was sent by the crew of the USS Essex, which was lost in the sector over two hundred years earlier. (TNG: "Power Play")

The Federation planetary distress signal was an emergency transmission that was to be used only when a Federation world was under imminent threat. Prior to transmission of a planetary distress signal, the head of council for the Federation planet needed to declare a planet-wide state of emergency.

The planetary distress signal was first known to have been transmitted in 2286, when a massive alien probe of unknown origin arrived in the Sol system, and began transmitting a signal that had a disruptive effect on power systems, and began ionizing the planet's atmosphere. All Earth orbiting space stations and starships were quickly rendered powerless, along with the planet's power generating systems. Within two hours, the president of the Federation Council declared a state of emergency. Massive weather systems caused by the drop in air pressure caused widespread damage across the planet.

Six hours into the crisis, the Federation president transmitted a planetary distress signal. The following is a transcript of the message:

"This is the President of the United Federation of Planets. Do not approach Earth. The transmissions of an orbiting probe are causing critical damage to this planet. It has almost totally ionized our atmosphere. All power sources have failed. All Earth-orbiting starships are powerless. The probe is vaporizing our oceans. We cannot survive unless a way can be found to respond to the probe. Further communications may not be possible. Save your energy. Save yourselves. Avoid the planet Earth at all costs. Farewell…"

The crisis was relieved by the crew of the HMS Bounty who were returning from Vulcan. Spock analyzed the transmissions of the probe and determined the transmissions were directed to an extinct species of humpback whales. The officers managed to retrieve a pair of the whales and delivered them to Earth. The probe shut down its transmissions and left the system. (Star Trek IV: The Voyage Home)

Another example of a planetary distress call is that which was transmitted by the Scalosians to attract starships to their planet so they could use the crew of the ship to repopulate their planet. The following is a transcript of the message:

"To any and all space travelers passing within range of the planet Scalos, I send you an urgent appeal for help. My comrades and I are the last surviving members of what was once a thriving civilization. Those of us who are left have taken shelter in this area. We have no explanation for what has been happening to us. Our number is now five, we were once a nation of 900,000, this city alone holding a total population of 113,477 citizens. Our planet Scalos, on which existed several culturally enlightened indigenous populations, has attempted to survive this mysterious and malignant affliction but to no avail. Should any passing spaceship receive this plea for aid, we entreat it to hastily change course and approach us without delay. We know now that what we have undergone cannot occur, while our own I fear is so tenu…"" (TOS: "Wink of an Eye")

In 2368, the USS Enterprise-D received a priority one distress call from the Federation colony on Dulisian IV, which requested an evacuation because of a massive failure of the environmental support systems. The crew later learned that this distress call was a faked one from the Romulans to move the Enterprise-D away from the Vulcan ships. (TNG: "Unification II")

In 2369, the Enterprise-D received another distress call via their long range sensors from a Romulan warbird. Worf informed Commander Riker about this call while he was treated in sickbay. (TNG: "Timescape")

The same year, Major Kira Nerys and Doctor Julian Bashir received a priority one broad band distress signal from Ty Kajada aboard the Kobliad transport Reyab. (DS9: "The Passenger")

In 2371, Gathorel Labin transmitted a distress call, which was picked up by the USS Voyager. Upon arrival, it was found that Labin only transmitted the distress call because he sensed the crew of Voyager was in distress. (VOY: "Prime Factors")

In 2372, Captain Kasidy Yates sent a priority one distress call to Deep Space 9 when the SS Xhosa was attacked by a Klingon Bird-of-Prey. The message was interrupted and Captain Sisko manned the USS Defiant to rescue the Xhosa. (DS9: "The Way of the Warrior")

In 2381, Captain Carol Freeman of the USS Cerritos ordered a distress call broadcast on all channels after Douglas Station was attacked by Texas-class automated starships. The USS Van Citters answered the call, but was overwhelmed, forcing the Cerritos to lure the deranged vessels away. (LD: "The Stars At Night")

In 2401, President of the United Federation of Planets Anton Chekov sent a planetary distress call during the Borg takeover of Starfleet on Frontier Day. In the distress call, Chekov warned all vessels against approaching Earth due to their young being assimilated by the Borg, leaving Earth on the verge of falling to the Borg. Chekov implored anyone hearing the message to save themselves until a solution could be found. Picking up the distress call, the command crew of the rebuilt Enterprise-D quickly determined that they were the only help that was coming to Earth. (PIC: "The Last Generation")

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