▶▶ 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.
YoRHa Soldiers, Attacker No.2.
‫جنود يورها، مهاجم رقم 2.
YoRHa-Einheit Angreifer Nummer 2!
YoRHa tipo atacante 2,
YoRHa tipo atacante 2,
YoRHa Attacker nº 2.
Unità YoRHa, Attacker numero 2,
Tropa YoRHa, Attacker Nº 2.
Боец YoRHa, Атакующий № 2.