A private company based in Berlin, Pennsylvania and staffed with 74 employees, Center Rock Inc. manufactures the drilling system used to rescue the miners. Its innovative pneumatic-based drilling system uses four hammers instead of one and can drill through as much as 40 meters of rock per day. Center Rock’s CEO Brandon Fisher, who reached out to the Chileans to offer the drill, was assisting on-site during the drilling of the rescue shaft.The super-strength cable sitting atop the large drilling rig was manufactured in Germany.