Interesting story about self-contained/sheltered living.
I live in Osaka but my company used to send me to Tokyo for weeks at a time for liaison work. The company had a Hilton HHonors thing going so naturally, they put me up at the Hilton Tokyo, located in Nishi-Shinjuku. However, the office I had to commute to every day was in Ginza; on the other side of the city and give or take, about twenty minutes away by subway.
Now the Hilton Tokyo is a little unusual being that it is one of a handful of hotels in Tokyo that has an escalator that goes directly down into the underground subway commuter paths from the hotel lobby. Many hotels/buildings are very near said escalators/stairs/elevators but only a few actually have access to the subway without having to step outside in some form.
In addition to this, as anyone who's been to a city in Japan can attest to, nearly all the subway stations have, in addition to the normal exits to ground level, various extra exits that lead directly to the nearby office buildings and department stores.
Ten days into one particular trip, something suddenly occurred to me. I was staying at the Hilton, taking the elevator down to the lobby, taking the escalator directly down into the subway system, taking the subway to the other side of the city, ascending straight from the subway into my office building for work...and then doing the exact opposite at the end of the day to get back to the hotel... all without stepping foot outside. I'd end up going to restaurants and going shopping at stores all located within or connected to the subterranean maze of Tokyo. So effectively, I was living my entire day-to-day life completely contained in a giant stretched-out arcology. I was somewhat stunned. So much so, that after I realized what I was doing, I decided I'd try to keep the streak going.
For just under four weeks, I was able to keep it going. The only thing that stopped me was when I finally took the shinkansen back to Osaka; JR and shinkansen platforms are nearly all above-ground. Sadly, (gladly?) my normal day-to-day life here in Osaka is not as 'sheltered'.
It somewhat reminded me of the Trantor I envisioned from Asimov's Prelude to Foundation where it was actually RARE for people to actually see the outside world, spending their entire lives in the endless subterranean levels of the planet. I can see how some people mind think it a little creepy, but I thought it was kinda cool. The Tokyo thing, not the Trantor thing.