A decommissioned Trident missile silo, converted into a home with a vertical garden where the rocket used to be. Not because I'm a paranoid survivalist, but because it would be cool. Imagine having movie night every week and screening A Boy and his Dog.
Probably, but I could just open the missile doors for the garden. Deeper down it's not really an option, unless you could fashion some "light pipes"--solid tubes of glass or other material with a high refractive index, a kind of thick fiber-optic. Down in the living compartments I'd have to rely on lots of fluorescent or LED lighting designed to emit the same wavelengths as sunlight, least I get SAD (Seasonal Affective Disorder). However, for the sake of science I wouldn't mind trying a completely air-tight and "off the grid" system to explore the ability to survive on recycled sources of oxygen, power, water and food. An introvert's dream.