Nova | Pbs

When 33 Chilean miners were trapped in a cave-in this August, rescuers had to dig through more than 2000 feet of solid rock to free them. It was the deepest rescue ever attempted, and it would have to be done fast. but how? To find out, we talked to Greg Hall, owner of Drillers Supply International, a small Texas company that helped drill the rescue shaft in a record 33 days. Produced by David Levin. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn more about the Chilean mine rescue, go to pbs.org/nova/tech