▶▶ 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.
Alert. In 9S's current state, attempting combat
puts a great toll on his body.
‫إنذار. في وضع 9.إس الحالي، محاولة
‫القتال ستسبب حملًا كبيرًا على جسده.‫
Warnung: Kampfhandlungen würden Einheit 9S
in gegenwärtigem Zustand überstrapazieren.
Advertencia.
Advertencia.
Alerte,
Attenzione:
Alerta. No estado atual de 9S, um combate
causará uma grave sobrecarga em seu corpo.
Тревога. В текущем состоянии 9S
сражение причинит серьёзный ущерб телу.