I've had thoughts like this in pretty much every building I find myself in :zombies_lol:.

 

In a city, it might be wise to locate in the tallest building around so you could look down on all other activity, thereby receive some warning of movements.

Then again, if there are helo's about, "tallest roof" becomes the most obvious and repeated landing pad. If you don't want visitors, maybe the 2nd tallest building would do.

I still think the 1985 version of American shopping malls was terrific with their Hickory Farms and food courts.

 

Love your idea of using the sewers to navigate. If you had it properly mapped out you could use them to get to shops for supplies and then make your way back to your safe locked up abode. And it sure would be more aesthetically pleasing than a prison. I think I'm going to steal your idea if there's ever a ZA lol!

 

The very last place you would want to be, in the Zombie Apocalypse or otherwise would be the sewer. Its literally suicide. First of all - you would contract and die from any number of horrible diseases. Surviving the zombies to die of Hepatitis or Dysentery isn't a win. There are all kinds of "sharps" down there to poke, prod, and cut you. There is also every disease the city can muster, plus some zoonotic illnesses that are resident in the huge rodent population. Remember - anything that goes down a drain ends up in there - including the body fluids of all the sick people in the city.. Then you have chemical contaminants - including things you wouldn't want to mix. Drain cleaners, bleach, lime scale remover, etc... Plus there is "bad air" - hypoxic environments, methane, excess CO or CO2, etc. Ever notice that the guys who work in manholes have a blower hose going into the manhole, and they carry a gas meter? Sanitary sewers would be a death trap for someone not properly trained, and wearing full PPE, and having a topside team to support them...

Storm sewers wouldn't be much better, but they carry the added risks of whatever washes into them from the street - like gasoline and oil, and whatever wildlife finds its way in there to dine on the tasty rats like venomous snakes, large turtles, alligators, fire ants, nightmare spiders from hell, etc. In a storm sewer you also have a constant risk of drowning. It may be blue skies and sunshine when you go in but a thunderstorm on the other side of the city may have just dropped 5" of rain. Unbeknownst to you - in about 20 minutes that dry pipe your standing in will be inundated with a six foot high wall of water traveling 30 miles an hour....

 

Hehe.
Yeah I had some of those thoughts too....