In 2011 explorers  Brent McGregor, Eduardo Cartaya and Scott Linn began photographing and mapping Mt. Hood’s Glacier Ice Cave. This was the largest glacier cave system in the lower 48 with more than 7,000 feet of passages. News coverage by OPB and the Oregonian brought much interest in the ice caves to the public. Only five years later, the caves are gone and collapsed. 

OPB has some stunning photos of what the cave looked like at discovery and after the collapse.

                                                         Cave Photos