Rich folks have had variations of these for a while, they called them "safe rooms". I've installed security alarms and phone/Internet lines in places like that, as well as monitors that show feeds from the house cameras. It's literally almost an entire house underneath the main house, ready for someone to seal themselves in and live in it for a couple months.
I like the hubris that if the world goes to shit and they have to hole up for months that they think telecommunications or security will still work how they expect it.
Locks, cameras etc. work on battery power just fine. Also, safe rooms are not intended for the apocalypse. It's where you hide from home intruders while you wait for the police.