▶▶ 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.
Wait, I lied! Just kidding!
I didn't say anything.
‫مهلًا، لقد كذبت! أمزح فقط! لم أقل شيئًا.
Nur ein kleiner Scherz!
Vergiss es einfach!
¡No es cierto! ¡No dije nada!
Olvídalo, no he dicho nada.
Pardon ! Je plaisante ! Oublie !
Ah! No, aspetta,
fa' come se non avessi detto niente!
Espera, era mentira!
Mentira! Não falei nada!
Нет! Это была шутка! Я пошутил!