Using The Cube
Or else they'd go directly towards detonating everything and not care about activating any buried tech in their lands.
I couldn't tell if they were going to activate both or just a single one. But my hunch told me they'd go to activate the two, and that was why I asked Lily to gush endless forces, not only towards the jumper's direction, but towards the remaining homelands of the enemy.
I told her to send most of our forces there, and appoint capable generals to lead the armies there. I spoke about the buried lost tech, their role and level of threat.
I instructed her to let her forces look for any gathering of the enemy, where they were digging the ground or trying to do some sort of ceremony.
It was safe to assume that the way to activate such tech depended on the same method, which I already guessed.