Halo: Combat Evolved
Developer(s) Bungie Studios
Gearbox Software (Windows port)
MacSoft Games (Mac port)
Publisher(s) Microsoft Game Studios
Series Halo
Release Date(s) Xbox
NA November 15, 2001[1]
EU March 14, 2002[2]
JP April 24, 2002[2]
AUS March 14, 2002[3]

Microsoft Windows
NA September 30, 2003[4]
EU October 10, 2003
Mac OS X
NA December 3, 2003[5]

Genre(s) First-person shooter
Mode(s) Single-player, multiplayer, cooperative
Rating(s) ESRB: Mature (M)
OFLC: MA 15+
Platform(s) Xbox, Microsoft Windows, Mac OS X
Successor Halo 2

Halo: Combat Evolved (commonly known as Halo or Halo 1) is a first-person shooter (FPS) video game developed by Bungie Studios. The first game of the Halo series, it was released on November 15, 2001 as a launch title for the original Xbox,[1] and is considered the platform's "killer app."[6] With more than five million copies sold worldwide as of November 9, 2005,[7] Microsoft released versions of the game for Microsoft Windows (developed by Gearbox Software) and Mac OS X in 2003, and the surrounding storyline was adapted and elaborated into a series of novels. The game was later released as an Xbox Original for download onto an Xbox 360 HDD.

In Halo's twenty-sixth century setting, the player assumes the role of the Master Chief, a cybernetically enhanced "SPARTAN" super-soldier. The player is accompanied by Cortana, an artificial intelligence who occupies the Master Chief's neural interface. Players battle various aliens on foot and in vehicles as they attempt to uncover the secrets of the eponymous Halo, a ring-shaped structure. The game has been called "easy to learn",[8] and has been praised for its "engaging story".[9]

Many game magazines have praised Halo as one of the best[10] and most important[11] games of all time. The game's popularity has led to labels such as "Halo clone"[12] and "Halo killer", applied respectively to games either similar to or anticipated to be better than it.[13][14] In addition, the game inspired and was used in the fan-created Red vs. Blue video series, which is credited as the "first big success" of machinima[15] — the technique of using real-time 3D engines, often from video games, to create animated films.



The Master Chief fires his Assault Rifle at a pack of Grunts.

As a first-person shooter, Halo: Combat Evolved has a gameplay fundamentally similar to that of its peers, focusing on combat in a 3D environment, and taking place almost entirely from a character's eye view. The player can move around and look up, down, left or right.[16] The game features vehicles, ranging from armored jeeps (Warthog) to tanks (Scorpion), alien hovercraft (Ghost) and even an aircraft (Banshee), all of which can be controlled by the player. The game switches to the third-person perspective during vehicle use for pilots and mounted gun operators; passengers maintain a first-person view.[17]

The player character is equipped with a damage-absorbing energy shield, in addition to hit points. The shield's charge appears as a blue bar in the upper-right hand corner of the game's heads-up display. When the shield is fully depleted, the player is highly vulnerable, and further damage reduces the character's health level.[9] However, the shield will recharge if no further damage is sustained for a brief period.[18]

Halo's arsenal consists of weapons from science fiction. The game has been praised for giving each weapon a unique purpose, thus making them useful in different scenarios.[19] For example, plasma weapons need time to cool if fired too rapidly, but require no reloading. Instead, players are forced to discard them after depleting their batteries. In contrast, conventional firearms cannot overheat, but require reloading and ammunition. All weapons may be used to bludgeon enemies,[18] which allows a player to silently kill opponents without alerting other nearby enemies.[20] Players may carry only two weapons at once; thus, a strategy is required when using and selecting firearms.[21]

The player can carry up to eight grenades at a time: four fragmentation and four plasma grenades each.[2] Like the game's other weapons, the two types of grenades differ; the fragmentation grenade bounces and detonates quickly,[22] whereas the plasma grenade adheres to targets and takes longer to detonate.[23] A controller button assigned to grenades eliminates the need to holster firearms before throwing.[18]


The game's main enemy force is the Covenant, an alliance of alien species. Their forces include Elites, fierce warriors protected by recharging energy shields much like the player's own; Grunts, which are short, cowardly creatures, usually led by Elites, and who often flee in terror instead of fighting unless an Elite is present; Jackals, which have highly durable energy shields attached to their arms; and Hunters, large, powerful creatures with thick armor plates that cover the majority of their bodies.[24]

A secondary enemy is The Flood, a parasitic alien life form that appears in three main variants.[25] Infection Forms, the true form of the Flood, are fragile, but often travel in swarms; they do little damage individually, but the swarms often number in the hundreds. Combat Forms result from humans and Covenant Elites who are infected by Infection Forms, and have hideously deformed bodies. Bloated Carrier Forms serve as incubators for new Infection Forms, and when wounded or near a potential victim, they explode to damage other nearby life forms and to release their spores. Battling the Flood, Covenant and player are the Sentinels, robotic drones designed by an extinct race called the Forerunners. Sentinels lack durability, but use powerful beam weapons and are immune to infection by the Flood.[25]

The artificial intelligence in Halo has been favorably received.[26] Enemies take cover and use suppressive fire and grenades.[19] Some enemies retreat when their superiors are killed.[27] The player is often aided by United Nations Space Command (UNSC) Marines, who offer ground support, such as manning gun turrets or riding shotgun while the player is driving a vehicle.[19]


Because Halo was released before Xbox Live, online multiplayer games were not officially supported.[28] The game instead uses local Ethernet or "system-link" that supports a maximum of 16 players. This setup was a first for a console game, but was often deemed impractical by critics.[20][19] As Halo lacks artificially intelligent game bots, LAN parties are needed to reach the game's 16-player limit. In addition to five customizable competitive multiplayer modes, two players may co-operatively play through the game's campaign.[16] Halo's multiplayer components were generally well-received by critics and is widely considered one of the best multiplayer games of all time.[29][30][17]

Although the Xbox version of Halo lacks official support for online multiplayer play, XLink Kai, GameSpy and XBConnect's packet tunnelling software provide unofficial ways around this limitation.[31] The Windows and Macintosh ports of Halo support online matches involving up to 16 players and include multiplayer maps not in the original Xbox release.[32] However, co-operative play was removed from the ports because it would have required large amounts of recoding to implement.[33] On March 15, 2004, Gearbox Software released Halo: Custom Edition for Windows, which enabled players to use custom-made maps and game modifications.[34]



Halo takes place in a science fiction universe created by Bungie Studios specifically for the game. According to the story, the overpopulation of Earth and the realization of faster-than-light travel have caused the human race to colonize other planets. A keystone of these efforts is the planet Reach, an interstellar naval yard responsible for building starships, and a hub of scientific and military activity.[18] A secret military endeavor, dubbed the SPARTAN Project, was established on Reach to create an army of biologically-engineered, cyborg "super-soldiers". Thirty-two years before the beginning of the game, a technologically advanced collective of alien races, the Covenant, began to attack human settlements. Declaring humanity an affront to their gods, the Covenant launched a holy war against the human race. The United Nations Space Command experienced a series of crushing defeats, and, although the super-soldiers of the SPARTAN-II Project fought impressively against the Covenant, they were unable to turn the tides of war.[18]

To prepare for a mission to discover the location of the Covenant homeworld by boarding one of its starships, SPARTAN-II soldiers were recalled to Reach for further augmentation. Two days before the mission was to begin, Covenant forces attacked Reach and destroyed the colony.[18] A starship, the Pillar of Autumn, survived the onslaught and initiated a random jump to slip space (similar to hyperspace),[35] hoping to lead the enemy away from Earth.[36]

The titular Halo is an enormous, ring-shaped artificial space habitat/planet, which (according to Bungie Studios) has a diameter of ten thousand kilometers.[37] Halo sits at a Lagrange point between a planet and its moon. Centrifugal force created by the rotation of the station provides the ring's gravity.[38]


Main article: Characters of Halo

The player character is Master Chief Petty Officer John-117,[39] one of the few (see Halo: The Fall of Reach and its sequels for more information) surviving super-soldiers of the SPARTAN-II project, and the main character of the story. Accompanying the Master Chief is the Pillar of Autumn's feminine artificial intelligence construct, Cortana, who resides in a neural implant connected to his battle armor, codenamed MJOLNIR Mark V. The Pillar of Autumn's captain, Jacob Keyes, is also a major character. Playing an antagonistic role in the game's events is 343 Guilty Spark, an eccentric artificial intelligence responsible for monitoring and maintaining Halo's systems.


The story is presented through an instruction manual, scripted events and conversations during the game, and in-game cut scenes. The game begins as the Pillar of Autumn exits slip-space near a mysterious ring-shaped space station, called "Halo" by the enemy of the game, The Covenant.[40] A Covenant fleet attacks and heavily damages the Pillar of Autumn. Jacob Keyes initiates "The Cole Protocol",[41] a procedure designed to prevent the Covenant from learning the location of Earth. While Keyes prepares to land the ship on Halo, the Master Chief and Cortana escape via an escape pod, which crash lands on the ring. Cortana and the Chief are the only ones that survived the impact of the escape pod crash.

Keyes survives the Autumn's crash landing, but is captured by the Covenant.[42] In the second and third levels of the game, the Master Chief and Cortana gather human survivors and rescue Captain Keyes, who is imprisoned on the Covenant ship Truth and Reconciliation. Once rescued, Keyes orders the Master Chief to beat the Covenant to Halo's control center and to discover its purpose.[43] The Master Chief and Cortana travel to a map room called the Silent Cartographer, which leads them to the control room.[44] There, Cortana enters the systems and, discovering something urgent, suddenly sends the Master Chief to find Captain Keyes, while she stays behind.[45] While searching for his commander, the Master Chief learns that the Covenant have accidentally released the Flood, a parasitic alien race capable of spreading itself by overwhelming and infesting other sentient lifeforms. Keyes falls victim to them while looking for a cache of weapons. The release of the Flood prompts 343 Guilty Spark to recruit the Master Chief in retrieving the Index, a device that will activate Halo and prevent the Flood from spreading beyond the facility.

After the Master Chief retrieves and begins to use the Index, Cortana re-appears and warns him against the activation. She has discovered that Halo's defense system is a weapon designed to kill all sentient life in the galaxy, which the Flood need to spread.[46] When confronted with this information, 343 Guilty Spark states that the installation technically only has a maximum radius of twenty-five thousand light-years, but that its pulse would trigger other similar installations as well, killing all sentient life in the galaxy.[47]

While fighting the Flood, the Covenant, and Guilty Spark's Sentinels, the Master Chief and Cortana attempt to destroy Halo before 343 Guilty Spark activates it. Cortana discovers that the best way to destroy Halo is to cause the crashed Pillar of Autumn to self-destruct.[48] However, Captain Keyes' authorization is required to destroy the ship.[49] By the time that they reach Keyes, he has been infected and turned into a Brain Flood. The Master Chief retrieves Keyes' neural implants directly from his brain, and Cortana activates the Autumn's self-destruct sequence. However, 343 Guilty Spark reappears and deactivates the countdown, discovering the record of human history in the process.[50] The Master Chief manually causes the Pillar of Autumn's fusion reactors to begin to melt down, and the Master Chief and Cortana narrowly escape the destruction of the ring via a fighter.


First official halo screenshot

The first official screenshot of Halo.

On July 21, 1999, during the Macworld Conference & Expo, Steve Jobs announced that Halo would be released for Mac OS and Windows simultaneously.[51] Before this public announcement, game industry journalists under a non-disclosure agreement had previewed the game in a private showing during E3 1999,[52] and were reportedly amazed.[51][52] Bungie Studios later stated an even earlier development build of the game centered on real-time strategy and was "basically Myth in a sci-fi universe."[53]

At E3 2000, the first trailer of Halo was well-received.[54] The version shown there differed greatly from the one exhibited previously, marking the first major overhaul in the game's development.[55] At this point, Halo was a third-person action game, in which a transport starship crashlands on a mysterious ring world that orbits a star. Early versions of Covenant aliens appear in great numbers and loot what they can, and war erupts between them and the humans. Unable to match the technologically advanced alien race, the humans on the ring world resort to guerrilla warfare.[56] This version of the game featured Halo-specific fauna, which were later dropped because of design difficulties and the creatures' "detract[ion] from the surprise, drama and impact of the Flood."[57]

As rumors had predicted,[58] Microsoft announced on June 19, 2000 that it had acquired Bungie Studios.[59] Halo became an exclusive game for Microsoft's Xbox video game console, and Bungie Studios rewrote the game's engine, heavily altering its presentation and turning it into a first-person shooter.[60] Originally a key element, the game's online multiplayer component was dropped because Xbox Live would be unfinished at the time of Halo's release. While a playable demonstration of the game at Gamestock 2001 was well-received,[61] critics had mixed reactions to its exhibition at E3 2001.[62][63][64] The game was released in North America simultaneously with the Xbox, on November 15, 2001.[1]

On July 12, 2002, a Halo port for Windows was announced to be under development by Gearbox Software.[65] Its showing at E3 2003 was positively received by some critics,[66][67] with skepticism by others.[68] It was released on September 30, 2003,[4] and included support for online multiplayer play and featured sharper graphics, but had compatibility issues that caused poor performance.[69][32] Halo was later released for Mac OS X on December 11, 2003.[5] On December 4, 2007, the game became available for the Xbox 360 via download from the Xbox Live Marketplace for 1200 Microsoft Points.[70]


Halo's soundtrack was created by Bungie Studios' audio director, Martin O'Donnell, and received enthusiastic praise from many critics.[17][19][21][9] O'Donnell has stated that his goal was to provide "a feeling of importance, weight, and sense of the 'ancient'."[71] He designed the music so that it "could be dissembled and remixed in such a way that would give [him] multiple, interchangeable loops that could be randomly recombined in order to keep the piece interesting as well as a variable length". Development involved the creation of "alternative middle sections that could be transitioned to if the game called for such a change (i.e. less or more intense)."[72]

O'Donnell has remarked that he "sat with the level designers and 'spotted' the level as though it was a movie, with the knowledge that the music would have to be malleable rather than static.... [T]he level designer would tell me what he hoped a player would feel at certain points or after accomplishing certain tasks". Based on this information, O'Donnell would "go back and develop appropriate music cues, then have the designer script the cues into the level, and then we'd play through it to see if it worked as desired."[72] He explained that the use of music in Halo is sparse because he believes that "[music] is best used in a game to quicken the emotional state of the player and it works best when used least", and that "[if] music is constantly playing it tends to become sonic wallpaper and loses its impact when it is needed to truly enhance some dramatic component of game play."[73]


Review scores
Publication Score
Edge 10/10
Fourth ever top score awarded
Electronic Gaming Monthly 10/10
Platinum Award,
Game of the Year
Famitsu 32/40
Game Informer 9.5/10[74]
GameSpot 9.7/10.[19]
Editor's Choice
GameSpy 85/100[9]
IGN 9.7/10[17]
Editor's Choice,
Game of the Year 2001
Aggregate scores
Aggregator Score
Game Rankings 96% (based on 90 reviews)[76]
Metacritic PC: 83% (based on 40 reviews)[75]

Xbox: 97% (based on 68 reviews)[1]

2002 Game Developers Choice Awards: Excellence in Audio
5th Annual Interactive Achievement Awards: Console and Overall Game of the Year,
Console Action / Adventure, Visual Engineering
2000 Game Critics Awards: Best Action Game

On its release Halo broke sales records; by April 8, 2002, one million units had been sold: this pace was faster than that of any previous sixth-generation console game.[77] During the two months following Halo's release, the game sold alongside more than fifty percent of Xbox consoles.[78] Halo's retail price remained at US$49.99 until November 30, 2003.[79] By July 14, 2003, the game had sold three million copies worldwide,[80] and by January 28, 2004, it had reached four million copies.[81] As of November 9, 2005, Halo has sold over five million copies worldwide.[7]

Halo was critically acclaimed and received an overall score of 97% on Metacritic.[1] Electronic Gaming Monthly observed, "This game has me totally mesmerized ... [It] engages your intellect on a whole different level", and of its multiplayer, "GoldenEye was the multiplayer standard for console first-person shooters... It has been surpassed," awarding the game a perfect score.[6] GameSpot claimed that "Halo's single-player game is worth picking up an Xbox for alone", commenting, "Not only is this easily the best of the Xbox launch games, but it's easily one of the best shooters ever, on any platform."[19] IGN remarked similarly, calling Halo a "can't miss, no-brainer, sure thing, five star, triple A game."[17] Edge called it "the most important launch game for any console, ever", and awarded it a 10 out of 10 score, only the fourth such rating in the magazine's 12-year history.[30] The game received numerous Game of the Year awards, including those of the Academy of Interactive Arts & Sciences,[82] Electronic Gaming Monthly, Edge, and IGN.[83] The British Academy of Film and Television Arts awarded Halo "Best Console Game", and Rolling Stone presented it with their "Best Original Soundtrack" award. According to, the game received a total of 48 awards.[83] Among the specific aspects that reviewers praised were the balance of weapons, the role of drivable vehicles,[17][5] and the artificial intelligence of enemies.[30][5]

Although Halo's overall reception was largely positive, the game received some criticism for its level design. IGN wrote that "the middle third of the game basically has ... the same level over again."[17] GameSpy gave Halo a considerably lower (abeit still positive) rating than other reviewers, later placing the game tenth on its "Top 25 Most Overrated Games of All Time" list. The site stated that the levels often "degenerated into recycling the same areas over and over until you were bored to tears" and were one of the few reviewers to complain about the lack of online multiplayer play, though Xbox Live had not yet been launched and GameSpy offered its Tunnel service to enable SystemLink games over the Internet[1].[31] Noting the level design as a problem, an article on Game stated that the game still "triumphs in understanding the anatomy of the FPS," and is "not so much about 'combat evolved' as the subtitle suggests, but about 'genre evolved'."[84]

Halo's PC port garnered mixed reactions and received a score of 83% on Metacritic.[4] GameSpot stated that it was "still an incredible action game ... [and] a true classic", awarding it 9.0 out of 10.[69] It received a score of 8.2 out of 10 from IGN, who stated, "If you've played the game on the Xbox, there's not much for you here."[32] Eurogamer called the game "a missed opportunity", but stated that the online multiplayer component was "a massive draw ... for Halo veterans".[33]


According to Gamespot, Halo's "numerous subtle innovations have been borrowed by countless other games since."[85] The game is often cited as the main reason for the Xbox's success,[86] and it began what is commonly known as the system's flagship franchise.[87] Game designer Vox Day credited the game with using science-fiction environments to follow Half-Life in eschewing static levels and a similarity to dungeon crawls, which the FPS genre inherited from Akalabeth. Day further wrote that Halo spurred a sustained trend of many other FPS console games.[88] On July 29, 2006, using criteria including revenue, average review scores, commentary, spin-offs and other elements, Halo was estimated as the second to top game of the twenty-first century, behind Grand Theft Auto: Vice City.[89] The game's popularity sparked the usage of terms like "Halo clone"[90][91][92] and "Halo killer";[13] the game Killzone was billed as the latter.[93][94] The Halo engine has been used for the game Stubbs the Zombie in "Rebel Without a Pulse".[95]

Halo has been featured at both Major League Gaming and the World Cyber Games.[96][97] In machinima, the game was used as the basis for the popular Red vs. Blue. The game's sequel, Halo 2, made US$125 million with unit sales of 2.38 million on the first day of its release,[98] earning it the distinction of the fastest-selling United States media product in history.[99] Three years later, Halo 3 shattered that record with the biggest opening day in entertainment history, taking in US$170 million in its first 24 hours.[100]


Further information: Halo (series)#Merchandise and List of Halo media

The story surrounding Halo: Combat Evolved has been adapted into novels, the first of which was Halo: The Fall of Reach, a prequel. Published in October 2001, this novel was written by Eric Nylund, who reportedly completed it in seven weeks.[101] The novel became a Publishers Weekly bestseller with almost two hundred thousand copies sold.[102] The following novel, entitled Halo: The Flood, is a tie-in to Halo: Combat Evolved, describing not only the experiences of the Master Chief, but also those of other characters on Installation 04. Written by William C. Dietz, this novel appeared on the Publishers Weekly bestsellers list during May 2003.[103] Nylund returned to write the third novel, Halo: First Strike, which takes place between the events of Halo: Combat Evolved and those of Halo 2. Written in 16 weeks,[102] it was published in December 2003.[104] Later novels, Halo: Ghosts of Onyx (written by Nylund and released on October 31, 2006)[105] and Halo: Contact Harvest (written by Joseph Staten) further extended the Halo storyline.

Another adaptation is the Halo Graphic Novel, a collection of four short stories released in July 2006.[106] It was written and illustrated by well-known graphic novelists Lee Hammock, Jay Faerber, Tsutomu Nihei, Brett Lewis, Simon Bisley, Ed Lee and Jean Giraud. Bungie Studios regards Halo's adaptations as canon.[107]


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  35. Keyes: [sigh] We made a blind jump. How did they... / Cortana: Get here first? Covenant ships have always been faster. As for tracking us all the way from Reach, at light speed, my maneuvering options were limited.
  36. Sergeant Johnson: Men, we led those dumb bugs out to the middle of nowhere to keep 'em from gettin' their filthy claws on Earth. But, we stumbled onto somethin' they're so hot for that they're scramblin' over each other to get it! Well, I don't care if it's God's own, personal anti-son-of-a-bitch machine, or a giant hula hoop, we're not gonna let them have it! What we will let them have is a belly full of lead, and a pool of their own blood to drown in! Am I right, Marines?
  37. Errera, Claude (January 10, 2000). "Interview with Matt Soell". Retrieved on August 4, 2006.
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  39. "Halo Story". Retrieved on September 7, 2006.
  40. Keyes: While the Covenant had us locked up in here, I overheard the guards talking about this ring world. They call it... Halo.
  41. Keyes: All right then, I'm initiating Cole Protocol article two. We're abandoning the Autumn. That means you too, Cortana.
  42. Cortana: Warning: I've picked up reports that the Covenant has located and secured the Pillar of Autumn's crash site. Good news is the Captain's still alive. The bad news is that the Covenant have captured all of the surviving men. Let's hurry and find the final lifeboat so we can link up with the rest of the survivors.
  43. Cortana: According to the data in their networks, the ring has some kind of deep religious significance. If I'm analyzing this correctly, they believe that Halo is some kind of weapon—one with vast, unimaginable power. / Keyes: And it's true. The Covenant kept saying that whoever controls Halo controls the fate of the universe. / Cortana: Now I see! I have intercepted a number of messages about a Covenant search team scouting for a control room. I thought they were looking for the bridge of a cruiser that I damaged during the battle above the ring, but they must be looking for Halo's control room! / Keyes: That's bad news. If Halo is a weapon, and the Covenant gain control of it, they'll use it against us and wipe out the entire human race. Chief, Cortana, I have a new mission for you. We need to beat the Covenant to Halo's control room. Marines, let's move.
  44. Cortana: The Covenant believe that what they call the "Silent Cartographer" is somewhere under this island. The Cartographer is a map room that will lead us to Halo's control center.
  45. Master Chief: So, what sort of weapon is it? / Cortana: What are you talking about? Master Chief: Let's stay focused. Halo: how do we use it against the Covenant? / Cortana: This ring isn't a cudgel, you barbarian. It's something else. Something much more important. The Covenant were right. This ring, it's Forerunner. Give me a second to access... yes, the Forerunners built this place, what they called a fortress world, in order to-- Wait... No, that can't be! Oh, those Covenant fools! They must have known! There must have been signs! / Master Chief: Slow down. You're losing me. / Cortana: The Covenant... found something buried in this ring; something horrible. And now they're afraid. Master Chief: Something buried? Where? / Cortana: The Captain! We've got to stop the Captain! / Master Chief: Keyes? What do we... / Cortana: The weapons cache he's looking for is not really... We can't let him get inside! / Master Chief: I don't understa-- / Cortana: There's no time! Get out of here! Find Keyes. Stop him. Before it's too late!
  46. Master Chief: The Flood is spreading. If we activate Halo's defenses, we can wipe them out. / Cortana: You have no idea how this ring works, do you? Why the Forerunners built it? Halo doesn't kill Flood; it kills their food. Humans, Covenant, whatever; we're all equally edible. The only way to stop the Flood is to starve them to death, and that's exactly what Halo is designed to do—wipe the galaxy clean of all sentient life. You don't believe me? Ask him!
  47. Master Chief: Is it true? / 343 Guilty Spark: More or less. Technically, this installation's pulse has a maximum effective radius of twenty-five thousand light years, but once the others follow suit, this galaxy will be quite devoid of life, or any least any life with sufficient biomass to sustain the Flood... but you already knew that. I mean, how couldn't you?
  48. Cortana: We can't let the monitor activate Halo! We have to stop him—we have to destroy Halo. According to my analysis of the available data, I believe the best course of action is somewhat risky. An explosion of sufficient size will help destabilize the ring and will cut through a number of primary systems. We need to trigger a detonation on a large scale, however. A starship's fusion reactors going critical would do the job. I'm going to search what's left of the Covenant battle net' and see if I can locate the Pillar of Autumn's crash site. If the ship's fusion reactors are still relatively intact, we can use them to destroy Halo.
  49. Cortana: I've located the Pillar of Autumn. She put down twelve hundred kilometers upspin. Energy readings show her fusion reactors are still powered up. The systems on the Pillar of Autumn have failsafes even I can't override without authorization from the Captain. We'll need to find him, or his neural implants, to start the fusion core detonation.
  50. Cortana: This won't take long ... There. That should give us enough time to make it to a lifeboat and put some distance between ourselves and Halo before the detonation. / 343 Guilty Spark: I'm afraid that's out of the question, really. / Cortana: Oh, hell! / 343 Guilty Spark: Ridiculous—that you and a warship's AI with such a wealth of knowledge ... Weren't you worried it might be captured, or destroyed? / Cortana: He's in my data arrays—a local tap. / 343 Guilty Spark: You can't imagine how exciting this is to have a record of all our lost time. Human history is it? Fascinating. / 343 Guilty Spark: Oh, how will I enjoy every moment of its categorization. To think that you would destroy this installation, as well as this record. I am shocked. Almost too shocked for words. / Cortana: He stopped the self-destruct sequence!
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See also

External links