salvatore candela is using a powerful ground-penetratating radar, or gpr as it's known, to gett information from the vastt areas between snow pipits using the pits thememselves as a refeference for hihis readings. >> the diggingng of pits and usg ground-penetrtrating radar realy tieses well together. since i''m imaging what's in the ground and they're actually digging in the area i'm imaging, they compliment each other in that if i have a question about what i'm seeing on the radar, i can go jump in a 5-meter-deep hole and actually see what is there. and bybyairing theheir visual observations with what's on the radar, it allows us to o come ta much stronger concnclusion about whwhere the annual l layer is or where a specificic densi change might be that they're looking for in the mass balance process. >> by dragging his gpr sled, named the bumblebee, and using the pits to calibrate it, candela is helping create a much better understanding of this dynamic glacial system. the researchers also map the movement of the ice with gps and 3-d imagery. >> ...successful? >> i think we're very success