▶▶ 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.
2B! Where did you hide?
It's okay now.
‫2.بي! أين اختبأت؟ لا بأس الآن.
2B, wo hast du dich versteckt?
¿2B? ¿Dónde te escondiste?
Ya puedes salir.
¿2B? ¿Dónde te has escondido?
Ya puedes salir.
2B ! Où es-tu cachée ?
Tu peux sortir !
2B?
2B! Aonde você se escondeu?
Já tá bom.
2B! Ты где?!
Можешь уже выходить!