You would have thought it would have been one of the most heavily guarded parts of the ship.
To the contrary, you'd think that nobody would pay much attention to a dedicated backup facility that is basically never needed for anything.
What you would
expect down there is things battened down, turned off, inactive and very, very difficult to activate without proper training and up-to-date passwords.
Although as the article illustrates, the facility does see some use even outside emergencies, and in some episodes even appears to be permanently manned. And it's those
episodes where the potential of hostile takeover gets realized...