Technician Bill Heisinger drills holes in the shaft wall for a plaque June 22 in a dedication ceremony the Sanford Underground Science and Engineering Laboratory at the former Homestake Gold Mine in Lead, S. D. Before the labs are built, crews must also stabilize the tunnels and install new infrastructure.
Far below the Black Hills of South Dakota, crews are building the world's deepest underground science lab at a depth equivalent to more than six Empire State buildings — a place uniquely suited to scientists' quest for mysterious particles known as dark matter.
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