▶▶ 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.
Search for 2B's black box signal.
‫ابحثي عن صندوق 2.بي الأسود.
Suche nach
dem Signal von 2Bs Blackbox.
Busca la señal de la caja negra de 2B.
Busca la señal de la caja negra de 2B.
Cherche le signal
de la boîte noire de 2B.
Cerca... il segnale della scatola nera di 2B...
Busque o sinal da caixa preta da 2B.
Ищи сигнал чёрного ящика 2B.