I think you'd have to add a giant skylight. Otherwise, I think you might get cabin fever living in a hole.
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.