[She lowers her gun and sighs. Really, explaining all of this crap wasn't her job. That fell on Seamus and Valentino. But. She'll do her best.]

Bridge. Locks onto your brainwave signature and pulls you into this world. That's the short of it. So, welcome to the apocalypse. Don't go up to the surface unless you want to die and if you've got a cellphone in your pocket, it's in your best interest to ditch it.