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| {{Status|Canon}}
| | '''Hydra''' was a [[UNSC]] general emergency code. It was almost never used due to its content. The Hydra code word signifies imminent threat from biological [[weapons]] of mass destruction.<ref name="onyx">[[Halo: Ghosts of Onyx]], page 183</ref> |
| '''Hydra''' is a [[UNSC]] general emergency code. It is almost never used due to its content. The Hydra code word signifies imminent threat from [[Bioweapon|biological weapons]] of mass destruction.<ref name="onyx">''[[Halo: Ghosts of Onyx]]'', Chapter 21</ref> | |
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| ==Usage==
| | [[Cortana]] used [[Slipspace]] to declare code Hydra after the discovery of [[Installation 05]] and its escaped [[Flood]]. The threat came from both the potential for the Halo's activation and the loose Flood that posed a significant threat to all life.<ref name="onyx"/> |
| In [[2552]], [[Cortana]] declared code Hydra via a [[Forerunner]] [[Superluminal communications|slipspace carrier wave]] after the discovery of [[Installation 05]] and its escaped [[Flood]]. The threat came from both the potential for the Halo's activation and the loose Flood that posed a significant threat to all life.{{Ref/Reuse|onyx}}
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| In [[2553]], cryo-jars risked turning into a "Code Hydra problem".<ref>''[[Halo: Retribution]]'', Chapter 18</ref>
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| ==List of appearances==
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| *''[[Halo: Ghosts of Onyx]]'' {{1st}}
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| *''[[Halo: Retribution]]'' {{Mo}}
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| ==Sources== | | ==Sources== |
| {{Ref/Sources}}
| | <references/> |
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| [[Category:UNSC codes]] | | [[Category: UNSC]] |
| | [[Category: UNSC Codes]] |
