Paleo Slide Set: Low Latitude Ice Cores: High Resolution Records of Climatic Change and Variability 
in the Tropics and Subtropics
Drill bit

This drill bit is tough enough and sharp enough to slice through meter after meter of solid ice. 
The bit is fitted onto the core sleeve, a hollow tube into which the ice passes after being cut.

Photo Credits:
Lonnie Thompson 
Byrd Polar Research Center, The Ohio State University