NieR.Automata.Ver.1.1a.S01E16.broken.Wings.720p.CR.WEB-DL.AAC2.0.H.264-playWEB

The machine lifeforms not only infected the YoRHa soldier units on the ground, they also infected the ＜Bunker＞ with a viral attack, activating a self-destruct sequence.

With this, the 13th Orbital Satellite Base ＜Bunker＞ was destroyed.

2B and 9S avoided infection from the virus and escaped the Bunker before it was destroyed.

Proposal: Find the remaining surviving YoRHa Soldiers and start another descent-to-ground operation on Earth to fulfill the mission.