The colonial chamber was like a building lying on its side. As the center of the entire colony, it was where the colonists lived, worked, socialized and entertained in an array of facilities.
Around the colonial chamber, there were also four spherical buildings made out of graphene material, connected to the colonial chamber by giant pipes. The four spherical buildings were the lifeline of the entire colony.
Mars was a planet covered by desert and volcanic ash which gives off an impression of being extremely dry.
However, the opposite was true. As early as a few years ago, the "Curiosity" rover sent back data that suggested the planet was actually rich in water resources! However, most of the water was brine and buried underground or mixed with the sand so it could not be directly consumed.