▶▶ Pod 153 - Report:

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.
We Scanners usually work alone
dealing with preliminary scouting.
‫نحن الماسحون نعمل بمفردنا عادة
‫ونتولى الاستكشاف الأولي.
Na ja, Scanner-Modelle wie ich
werden meist allein entsandt.
Los de tipo escáner solemos hacer
misiones en solitario.
Los de tipo escáner solemos hacer
misiones en solitario.
Les modèles Scanner
bossent principalement en solo.
Noi Scanner lavoriamo
principalmente in solitaria.
É que nós do tipo Scanner
normalmente vamos sozinhos.
Мы, тип «Сканeр», обычно работаем
одни, проводим первичную разведку.