In the Thursday War, its stated that huragok(Engineers) are on the Infinity, and are responsible for a lot of the advancements they have. Where are they in Halo 4?
I may be answering my own question here, but maybe in the 3rd book in the trilogy, something happens to the huragok, killing them?
[Edited on 12.09.2012 12:14 PM PST]
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Although with the size of Infinity, the Huragok on board are probably constantly on task with maintenance, the amount of people on board using communication equipment, running the engines, servicing thousands of vehicles and millions of weapons.