[Luis Dias]

If I remember well, it is a very perturbing element in the plot, in the sense that makes you completely paranoid at that moment thinking that you are much much more alone and surrounded than you had even imagined previously. Not only were the UEF outgunned, there were even enemies within the safest places that you thought were in control. The worms were everywhere around you, and you shouldn't even sleep without one eye wide open.

[Phantom Hoover]

A plot hole is a place where the plot fails to make sense, i.e. some part of the implied narrative is inconsistent with another. This is simply a mystery.