Erinaum sets up antennae around the tunnel entrance. The frequency used repels EMP waves. The ERLUs resume work. Scouting drones are sent down each tunnel. Every moment of their investigation is recorded.
No.
There's no way you could have known it was an EMP, all we told you was to evac electronics, and it's your fault you didn't listen.
EDIT: That and there is no such thing as an antennae that can repel an EMP, if anything the antennae is powered, and therefore is taken down with it.