Hundreds of feet below the surface, a vast network of tunnels stretches for miles — carved entirely from shimmering white talc. Cameras reveal enormous caverns, machinery echoing through the dark, and ...

Amid the light brown sand and sparse scrub of outback South Australia, up springs Talc Alf's workshop, crafted using salvaged materials and emblazoned with the words "Reppublic [sic] University of ...