The Democratic Republic of Congo (DRC) is the world’s largest producer of cobalt, a rare earth mineral that is essential in the production of technologies. In this hybrid documentary, South African artists Francois Knoetze and Amy Louise Wilson, together with Congolese historian Joe-Yves Salankang Sa-Ngol, trace the trans-continental journey of this precious metal: from its violent extraction in the mines of DRC to its sale on global stock markets. The Rock Speaks weaves a complex contemplation on an urgent ecological crisis that is fuelled by obscene labour practices that our technological systems demand.