Nicolas Young prepares to drill a beryllium sample from an glacial erratic perched in Greenland.

Nicolas Young and team hike on the Greenland Ice Sheet in southwestern Greenland.

The Young camp visible along the edge of a string of ‘threshold’ lakes along the edge of the Greenland ice sheet.

Mederith Nettles and Kira Olsen retrieving broadband seismic stations around the Greenland ice sheet.

Meredith Nettles and Kira Olsen inside the East GRIP tunnel built by digging trenches and then packing ice around a large inflatable balloon. The balloon is then de-inflating leaving the tunnel. Several tunnels connect to make this ice cave.