Suburbs

* See also Tunnels
* See also Construction
* See also Streets
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The City's population reproduced during and after the influx of Immigrants. I have allowed/projected a population of 40000 by the time of the Kashmir Massacre in the MMORPG's story.
New Housing would be needed, and to be less extravagant - So more utilitarian spaces were needed.
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Commuting into 'The City' from the 'Suburbs' :
* Residential areas spread out from Rapture with numerous people who didn't care to spend their lives in tiny city apartments. Atlantic Express lines brought people into the City for work and took them home at night. Trolley 'Suburban' lines were extended to reach the 'near' communities.
* A whole mountainside (the leeward side) of Mt_Ryan was open to development and some entrepreneurs built a substantial number of 'houses' and communities outside the City. The cost was held down because the buildings were largely tunnels in bedrock ( built using the tunnel boring machines ) and did not require large foundations or expensive structural materials (Ryanium) -- They required only a few small windows. The typical house was 10 X as large as the typical apartment in the city. 'Yards' in large-ish tunnels offered space for gardens and other 'outdoor' type activities. Fortunately Mt. Ryan is largely 'diamond hard' igneous rock, well suited to self-supporting tunnels and caverns.
* Networks of large underground caverns and tunnels were built to interlink the houses and community facilities ( the tunnel boring machines cost about the same whether they were operating or not ). Numerous parks were planted and specialty agricultural produces took advantage of the spaces. 'Town' Trolley systems were used for local transportation. Bicycles were also actually usable with the tunnel paths, without heavy/congested city traffic .
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Automobiles in Raptures Suburbs :
A later development in the second phase of Rapture Construction - Future plans had continuing expansion of 'Suburbs' to handle Rapture's population increase.
The Transport Tunnels built requiring small profile for 'cars' ( not exactly the HUGE 1950s type cars ).
Convertibles, because the roadway tunnels are frequently drippy. ( Hmm, simulated rain in places ... )
Bicycles (being most common) have the 'right of way'.
Of course there would be Trucks to transport/distribute goods ( for areas not immediately near a Trolley station ). The 'suburbs' would grow to have many thousands of people living in them eventually (and they are lower density than the rest of Rapture).
Trolleys would still be used ( are also needed for Freight transport ) - Really they are just tracks running in main inter-cluster city-connecting tunnels/Viaducts. ( They have a much larger size-profile than 'Cars'/Automobiles ).
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Electric cars (batteries) have limited range ( but distances in Rapture aren't that far ). Not overly exciting but maybe better for service vehicles.
Fuel type autos have noxious exhaust ( air is closed in and limited, the fume stick around ). Some fuels are better than others for pollution, but expenses are the issue.
Compressed gas ( like liquid/compressed Nitrogen - totally non-polluting ) used with airmotors, quite possible but not well developed.
Sorry, no peddle cars.
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NOTE - The 'Suburb' expansion of Rapture was only beginning 'when everything went sideways', and there were far more plans/preparations for all of this which had been being formulated.
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Levittown - Example Of How Suburbs Really Started In The US :
Inexpensive mass production (economy of scale), market for new families post-war baby boom (market demand).
Open/previously unused space to develop -- semi-rural section of Long Island, but with close proximity to transportation to one of largest/most important cities in world (jobs ...)
Growth/maturing of flexible transportation - Automobiles and high speed Roads, well connected Trains.
Capital ($$$) available to make the project happen on a sufficient scale ( neighborhood sized development of single family houses by one developer - something new at that time ).
Population (buyers) seeking a different living environment than available in cities ( and access to big city jobs/conveniences/advantages that small towns couldn't have ).
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Lessons learned from earlier Rapture experiences - many people have a desire for "more Space" (including private 'outdoor' space - if you can call underground cavern-like situation that).  Expanding population in Rapture called for new construction.  'Suburb' areas using latest construction technologies ( Tunnels cut in stable bedrock cut construction costs significantly ).
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Back to the Farm :
Parallel development to the 'Suburbanization' of Rapture.   Farms as a business niche.   Entrepreneurs selling 'farms' to people getting tired of Citylife ('bought the farm' wasn't ONLY a euphemism for dying...)
Tunnel-technology ("Ryan Cutters") efficiently fracturing rock with intense heat/temperature differentials ( cutting the cost of building the large volume/space farms required ).   Certain areas in Rapture had the right kind/formations of seabed rock - Solid volcanic (igneous) lava flows from the old volcano ...  Large continuous beds of rock required (at the right depth) to build a network of Tunnels and small caverns.   Tunnels, largely being self-supporting, requiring minimal structural additions and expense ( mainly there water sealing against high pressure of the depths ).
Mirrored interior surfaces make it look bigger ( good efficient electric lighting ).  Heated using Rapture's standard hot water network originating in the Southern Geothermal fields (Hephaestus, etc...)
Excess Oxygen - requiring techniques to generate/bring in Carbon Dioxide for continued plant growth ( possibly pairing it with some industry which generates 'CO2', or (profitably) tying into the Cities air circulation system ).
Meanwhile, back at the Ranch ...    - Animals raised also - a secondary operation to provide the vegetation food they would eat ( cut out the middleman ).   Animals are 'CO2' producers, and 'O2' consumers.
Fish Farms fed with farm produced grains, etc ... ( They also consume oxygen ).  Algae recycling methods would be more efficient than terrestrial plants (given cheap power and heat).
SELF SUFFICIENCY - Leveraged for the MMORPG story to help account for more people Surviving til the game's time.
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