>> obscene undertaking, and involves moving lots of raw and refined materials to mars. Or they can dig a hole and/or pile mars dirt on top of their living stru

>> obscene undertaking, and involves moving lots of raw and refined materials to mars. Or they can dig a hole and/or pile mars dirt on top of their living structures. Some materials are better than others at absorbing radiation but, as a general rule, mass/depth of the protection counts more than composition.