These electromagnetic barriers are only set up to counter outsiders. It seems like a basic defense system on the base.
IDs that aren't in the city's records will be stopped.
Yep. Have you also noticed it?
None of these devices are damaged.
That means the "enemy" who entered Atlantis before you and triggered the submergence mechanism was not blocked by these barriers.
Who the hell... are we facing?
Don't tell me the city's haunted.