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Silent Running Mode
But only whiffs of paraffin
Or creamy rings that fizz and fade
Show where the one-eyed Death has been
That is the custom of "The Trade."
The Trade by Rudyard Kipling

Sometimes the only way to survive against the enemy's ships is to be stealthy. In this situation, the ship and crew tries to be as quiet as possible, knowing that the slightest sound and/or energy reading could be picked up by the enemy's sensors and draw their fire. This often involves deactivating all non-essential systems on the ship for awhile.

This trope is almost invariably featured in a Sub Story. This trope has also been Recycled In Space, and many a Cool Starship has been called upon to do submarine-style silent running. Often this depends on the unrealistic conviction that there is sound in space, but it could be denoted as minimizing heat discharge or something similar to prevent detection by sensors. Not to be confused with the film Silent Running.


Examples:

Film
  • Das Boot, Truth in Television with the portrayal of true silent running in undersea warfare.
  • Down Periscope both plays this straight and subverts this trope at different points in the movie, including the time that an all-hands singalong to "Louie Louie" is a vital part of their disguise. This might be a reference to the The Hunt for Red October example below.
  • In the movie version of The Hunt for Red October, they switch on the silent propulsion system and the crew starts singing the Soviet National Anthem. One of the crew worries that they'll be heard. Ramius says to let them sing.
    Jonesy (on the USS Dallas): The Russian disappeared. One minute he was steady 4000 yards off the bow and... then he was gone. And for a second, I thought I heard...
    Capt. Mancuso: Heard... what?
    Jonesy: I thought I heard singing, sir.
    Capt. Mancuso: Singing?
    Jonesy: ...Yes, sir.
    • Not to mention "All stop, quick quiet!" (See below.)
  • The Matrix, when the Nebuchadnezzar has a close call with the sentinels.
  • Han's whole cling-to-the-Star-Destroyer-and-drift-away thing in The Empire Strikes Back counts, and if not, several times in the Expanded Universe (Thrawn trilogy?).
  • The Wrath of Khan used the nebula as a variant. Its radiation scrambled the sensors of both ships.
    • Also The Undiscovered Country which has a Klingon Bird of Prey that can fire while cloaked - Uhura even says something to the effect of "if they're here, they're rigged for silent running."
  • "Hide and seek" in The Last Starfighter.
  • Wing Commander: Numerous examples, ranging from individual fighters to an entire fleet of ships, using the "energy and heat signatures" version of the trope. For best effect, they typically attempted to conceal themselves in the clutter of an asteroid or debris field, or in the case of the fleet, by putting themselves in low orbit over a planet. At one point, the heroes' Battle Star is attempting to lay low inside of an asteroid's crater, while the Kilrathi methodically drop warheads into each crater trying to find the one the Terrans are sheltering in.
    • One particularly infamous moment as the crew sitting silently on the bridge, warned that them speaking or making any noise could be picked up...through space...by the Kilrathi ships.
  • Done twice in Master and Commander. First, Captain Aubrey has his men tow a crippled HMS Surprise into the fog to avoid further bombardment by the French frigate, Acheron. Then later when Acheron sneaks up on the Surprise again, Captain Aubrey uses a decoy to distract his opponents and keeps the lights of the stern at the Surprise well doused, all the while running a course east in order to bring the ship on Acheron's tail the very next morning.
  • Blue Thunder had this as one of the features of the eponymous helicopter.
  • In Batman Begins, the Batmobile has a stealth mode. Despite being right in the middle of several cop cars on a two-lane highway, somehow nobody notices the gigantic all-terrain military vehicle. To be fair, it was night and most of the streetlights were out, but still ...

Literature
  • Referenced in The Areas of My Expertise in a table of short words and abbreviations used by submariners to conserve oxygen. It contains the term "SR" for Silent Running mode. It claims that the term comes from the movie Silent Running, because it is the sub-mariners' favorite movie.
  • Yep, The Thrawn Trilogy. Kaarde starts out Dark Force Rising hiding on an asteroid, watching the Empire take over Myrkr. He only gets caught because Thrawn knows Kaarde is exactly the sort of person to do that, and he only escapes because his Force-sensitive copilot turned everything back on before Thrawn's Interdictor Cruisers finished generating a gravity well trap.
    • There's a point in Galaxy of Fear where our heroes, on the run from the Empire, set down on an airless rock, power down every system they can spare, and watch a Star Destroyer pass overhead.
    • Thrawn specifically tells Captain Pellaeon not to initiate a focused scan of the asteroid, which would have revealed Kaarde's ship but would also have tipped Kaarde off and let him escape (similar to an active ping on a submarine).
  • One of the common concepts of the tactics used in the Honor Harrington books is that the spaceships used in the battles are virtually invisible when the "wedges" that normally propel them are powered down, and the rare obedience to physics means that a powered-down ship is not motionless and can coast on a ballistic course with virtually no chance of detection. They're almost incapable of maneuvering, though. Honor uses this trick, along with a ridiculous amount of luck, to get the drop on a Havenite fleet guarding the Cerberus system, from which she and a few hundred thousand POWs and Peep political prisoners are attempting to escape.
    • Specifically, a ship without its wedge powered is invisible to gravitic sensors; it continues to emit everything else (heat, EM, etc) as normal and still presents a perfect target for radar and laser systems. However, lots of commanders in the Honorverse don't bother with anything but the gravitics, since gravitics operate at FTL speeds as opposed to light-speed EM-based methods, and it's assumed that any ship attempting aggressive action will have to have its wedge running. Basically, Honor's entire plan hinged on the Peeps being terminally lazy and failing to check their EM sensors. In a later novel, she and Michelle Henke hung a giant pair of fuzzy dice on the tactic for the benefit of a gaggle of hero-worshiping midshipmen, dissecting all of the myriad ways the Peeps could have spotted Honor coming light minutes away and turned her entire fleet into space junk with a single salvo. To quote Henke below:
      Michelle Henke: All things considered, Her Grace's plan may not have been the single rashest, most foolhardy, do-or-die, all-or-nothing throw of the dice in the history of the Royal Manticoran - or Grayson - Navy. If it wasn't, however, I have so far failed to find the plan that was.
  • In Stephen Baxter's Xeelee Sequence novel Exultant, when an asteroid base goes into stealth mode, everyone around the base is quiet. One character points out that there's no reason for this, but another responds that it's purely psychological—being quiet helps everyone feel that they're being stealthy.
  • World War Z. Attempted during a battle between two Chinese submarines. Underwater zombies mess it up.
  • Given that Glen Cook's Passage at Arms is basically a Sci-Fi retelling of Das Boot, it's not surprising at all that it has this trope up the wazoo. Cook even invents a special spaceship type for this, a so-called "climber", that "climbs" into the higher levels of hyperspace inaccessible to other types of ships. In his typical Shown Their Work fashion he amply lampshades that the main problem for such ships is overheating.
  • The Lensman series features at least one ship with a Silent Running Mode. Ships can detect each other at a distance by picking up stray emissions from the atomic power plants which supply their energy, but unscreenable noise from their own power plants limits the range of detection to a value which is roughly the same regardless of ship type. A special ship is built in which the atomic plant can be shut down completely for short periods, with enough power to run essential systems provided by a diesel-powered generator. This simultaneously increases the ship's own detection range by at least an order of magnitude, and renders it immune to long-range detection by other ships (though it can still be picked up by short-range systems such as telescopes and radar).
  • Used interestingly in the Star Trek novel The Great Starship Race. Kirk orders the Enterprise rigged for silent running as they play cat-and-mouse with a Romulan ship. But he then has Spock emit a subspace radio signal of just one watt. The Romulans focus all their scanners on that one little watt trying to find the ship, only for Spock to then open up the transmitters and hit them with a high-intensity wide-spectrum radio broadcast that overloads and fries the Romulans' sensors.
  • In Deliverance Lost, the Avenger sneaks out of the Isstvan system by shutting down almost every system, leaving the crew cold and dark for days. It's not explicitly stated how it helps escape detection, but a reasonable assumption is that the ship is minimizing its electromagnetic signature.

Live Action TV
  • The Star Trek: The Original Series episode "Balance of Terror." A virtual remake of the 1957 film The Enemy Below.
    • Martian Successor Nadesico has its own "Balance/Enemy Below" episode that reference both the original and the remake. It was also a bit silly.
    • The Star Trek: The Next Generation episode "Face of the Enemy" specifies that a Romulan ship's systems have to be perfectly balanced and calibrated in order for its cloaking device to work; this was exploited when a Federation sympathiser created an engine imbalance to 'poke a hole' in the cloak and allow Enterprise to detect it.
      • In Star Trek: Deep Space Nine, the show's main Cool Ship, the Defiant, had a cloaking device. Since in the earlier seasons the Big Bad Dominion had weaponry that could easily destroy Federation starships, the Defiant's only real defense upon being approached by a Jem'Hadar ship was to cloak, go to Silent Running Mode and pray they weren't noticed.
      • The Jem'Hadar started scanning with a form of radiation that no Alpha Quadrant spacefaring power used; accordingly, the Romulan officer who was acting as trainer/consultant didn't know if the cloaking device would block it; it didn't. Presumably, the next generation of cloaking devices did.
  • The only time anyone was able to destroy a Mimbari battleship in Babylon 5, Captain Sherridan was hiding his light cruiser in an asteroid field. He then had the nuclear warheads on board modified into mines, while the battleship kept searching for them. The human ship then send out a distress call, which immediately gave away their position and had the Mimbari chase right after them.
  • Firefly:
    • In the pilot episode, the characters had to do this against the Alliance to keep from getting boarded and searched as they do some illegal salvage — unfortunately for our heroes, their residual heat signature is still detected so they have to escape by throwing out a decoy.
    • When rescuing the Captain from Niska's space station, Wash has Serenity going unpowered so Niska's men won't see them coming. Given this means no maneuvering, Zoe compares it to throwing a dart from six thousand miles away.
  • Airwolf liked to do this all the time. Well, not literally all the time, because then they wouldn't get to draw attention to it, but that switch was flipped fairly often. One episode involved a group of criminals infiltrating a base in a helicopter (a normal one). They did this by shutting off the engine just before getting close, letting the inertia of the spinning rotor land them safely without making much noise. This actually tips Hawke about the identity of the criminals, as this trick was pioneered by him and his brother during the Vietnam War.
  • Ditto Blue Thunder, the other show about a super-advanced helicopter.
  • Red Dwarf:
    • In one episode, every system aboard Starbug but for the bare minimum needed to survive was switched off in an attempt to hide from a simulant's scanners. Their cover was blown when a robot (who was the robot equivalent to an alcoholic) bumped into a control panel, turning some of the ship's electronics back on.
    • An earlier episode establishes the concept when hiding from simulants, though the AR machine prevents it.
  • Mildly invoked in the episode "Justice" from Smallville. While infiltrating a LexCorp complex, Green Arrow turns off his communication feed with Watchtower by saying, "Switching to silent running." Presumably, this is so he can plant explosives throughout the complex without having to listen to potential objections from Chloe.
  • A rare version from the Age of Sail. In the Horatio Hornblower TV series, Hornblower manages to sail his tiny cutter into the middle of the Spanish fleet in some fog. They try Dressing as the Enemy and being very quiet. It doesn't work.

Western Animation
  • Futurama: "Nobody make a smell!"
  • In the Space Ghost Coast to Coast episode "Flipmode", Space Ghost is putting on a murder mystery dinner set in a submarine. At one point (high on natural gas) he yells, "We're in silent running here. Moltar, we are in silent running! (louder) Do you understand the concept of silent running?!"

Video Games
  • Possible, but rarely used in Mechwarrior 4. Mechs could shut down completely to remove themselves from electronic detection. This wouldn't make you invisible, but a good observation point could let you set up an ambush.
  • Starsiege has a more traditional variant. You can, for the most part, 'run silent' through a combination of switching your radar to passive detection and using heat/energy signature dampeners like the thermal diffuser. Using an Invisibility Cloak outright actually made this tactic more effective, not less, because one of the cloak's secondary effects reduces some of your emissions as well. Specific radar types actually encouraged running silent constantly, so as to remain as sneaky and hard to detect as possible. This was generally not necessary in singleplayer, but was incredibly effective in multiplayer.
  • In the Fallout series of games, the Silent Running perk takes the phrase much more literally. You can run silently.
  • Included in the Silent Hunter Series, and frequently necessary for survival.
  • All Stealth Based Missions involve this in Nexus: The Jupiter Incident.
  • Shattered Horizon allows players to switch off the non-essential systems of their suits to avoid giving off light, showing up on radar, or being affected by EMP grenades. However, doing so disables the suit's thrusters, HUD, and audio simulation, so if you're spotted you're pretty much a sitting duck until you can get it switched back on.
  • The Normandy of Mass Effect can briefly use one of these. Stealth in Mass Effect consists of trapping EM radiation in heatsinks. The duration of silent running is limited to how much energy the sinks can store; if they exceed capacity, they will discharge into the ship itself, cooking the crew.
    Joker: Stealth drive engaged. Only way they'll detect us is if you all start singing the Russian national anthem.

Real Life
  • The film The Hunt for Red October got some of it right: submarines are designed to be as silent as possible.In a situation where immediate silence is called for, the order given is "All stop, quick quiet", which means just what it says: the screws are immediately stopped, all communication is done by whisper or hand signs, and where you are standing is where you remain standing until the order is lifted.
    • Interestingly, diesel subs are in general much quieter than nuclear boats. That's because on the nuclear sub the reactor cooling must be on all the time, lest it suffers a meltdown, and cooling pumps tend to be quite loud. Also, being large and heavy contraptions, they are exceedingly difficult to completely isolate from the hull. Even with the newest reactor designs, where the cooling could be driven by natural convection on low power settings, the rush of coolant itself through the tubes creates a fairly loud hum, and the reactor is even more difficult to completely soundproof. Diesel subs, on the contrary, can turn off virtually all their systems in silent mode, the batteries or fuel elements are intrinsically silent, and electric motors on the low power produce virtually no noise. So the loudest sounds on a diesel sub would probably be from the crew moving around.
    • However, while a diesel sub can be quieter, it has to run at no deeper than periscope depth to run the diesel and recharge the battery, and can only run at depth for a limited time, until it becomes necessary to go back to periscope depth to charge the battery again. Nuclear submarines can operate submerged until the crew runs out of food, so despite being noisier than diesels, they have replaced diesels in the most advanced navies of the world.
    • The standard U.S. Navy order is "Rig for silent running." Submarine personnel then go through a series of checklists in which equipment is organized to be as quiet as possible.
  • See this article. It was and to a lesser degree still is possible to move a whole strike fleet very close to the target if it doesn't give itself away. By the same token, planes may be run into an ambush where the first sign of a missile ship they see is a radar suddenly locking them from below.
  • In the Sixties the CIA realised they needed a stealth helicopter for infiltrating countries like North Korea. Although realising a completely silent helicopter was impractical, they took a standard helicopter and worked on reducing the noise signature of each component — modifications included replacing analogue components with early electronics and adding an extra rotorblade. Eventually they came up with an aircraft that when flown at a particular speed, along with nape-of-the-earth flying, was unlikely to be detected unless you were specifically listening for it.

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