A massive force of underground BETA is heading towards the Soviet Base, and there's no time to do anything but pack up and leave. Yui stays behind to destroy the Type 99 Cannon, but the Soviets want it for themselves...
I was doing maintenance work so they 
didn't see me. I've been hiding.
Ya que estuve trabajando en el mantenimiento,
Como estuve trabajando en el mantenimiento,
Eu estava na manutenção, então eles não me viram. Fiquei escondido.