Hack the Planet
Hack the Planet is an Adventure on Nessus. It is unlocked in tandem with all other Nessus adventures after completion of the mission Six. It is narratively related to the adventure Deep Conversation, and Release.
During the course of Hack the Planet, Ghost has the idea of using Failsafe's computational firepower to hack into the cybernetic core of Nessus and steal as much information as possible from the Vex Network. This plan backfires however when a Network Mind arrives on the scene to capture Failsafe and prevent her from robbing the Vex. Failsafe is captured and imprisoned by the Vex while the Guardian and Ghost work out a way to rescue her, which they ultimately do, though due to differences in relative time inside and outside the Vex Network, what to the player was only a few minutes captivity, to Failsafe was a decade behind virtual bars. This traumatic experience may be why Failsafe is so insistent during a narratively later adventure, Release, that imprisonment by the Vex is not a fate she would wish on anyone, and that it is better to die than be held by the Vex. During this decade long imprisonment, Failsafe manages to converse with another "fellow prisoner" of the Vex, whose identity is not known but who may be Osiris, this could explain why Osiris is aware of our events during Deep Conversation. The Vex authentication manufactured by Failsafe and given to Ghost during that mission could also be the product of Failsafe's decade long imprisonment and subsequent familiarisation with Vex technology protocols.