Architects working in Antarctica face numerous challenges, not least freezing temperatures and long periods of total darkness in the winter and near endless light in the summer. Despite these obstacles, architectural fi rms continue to build impressive, functional structures in these harsh environments. Brooke Theis asks polar architects including Hugh Broughton, whose work includes the Halley VI Antarctic Research Station and Juan Carlos 1 Spanish Antarctic Base, and Rick Petersen, principal at OZ Architects, about the unique challenges of building at the end of the earth.