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A city placed in a harsh environment, such as on an airless moon or underwater, will require environmental enclosures for all buildings.
The first harsh environment colony is most often on a moon in order to mine eludium and possibly lumenite, which is used to manufacture starships.
Electricity shortage will result in "Powerless in harsh environment" morale penalty and possible decay.
Citizens will start labor jobs regardless of day/night cycle, or presence of electricity in the city.
Underwater cities have a few extra effects along with the normal ones listed above:
WIP, see patch notes below
Life Support Requirements
To build a building in a harsh environment, the building blueprint will require to be specifically designed for that environment.
The construction materials required are entirely dependent on the building blueprint.
Biodomes
A biodome protects against the harsh environment, all buildings constructed inside a biodome won't require any life support. So normal habitable world building blueprints can be used inside a biodome.
Under sea cities are enclosed like cities in unbreathable atmospheres. The enclosure beams and columns are much thicker and textured with a coarse concrete pattern.
Town Square can be built in the sea if the water is deep enough.
Roads can be built in the sea if the water is deep enough. They cannot transition between above water and below water. Cities under the sea cannot be connected by road to cities on land.
Buildings can be built in the sea if the water is deep enough for the harsh environment enclosure. The height of the enclosure is tall enough to fit the tallest building of that type made from its current material, just like on moons. That means the material will affect the minimum water depth required for each building.
Biodomes can be built in the sea if the top of the dome does not breach the surface of the sea.
Ship yards will spawn submarines just above the building, within the bounds of the building site.
Wharfs will produce fish and they will connect under sea cities with other cities that have a wharf.
Under sea cities are treated like other cities in an airless environment. Air must be imported/manufactured.
Spacecraft will land at the airport of an under sea city. If the tarmac is not enclosed, they will probably suffer a lot of damage from the sea while sitting there.