Mountaineers Brent McGregor and Eddy Cartaya invite the Oregon Field Guide crew on an expedition to film and explore the largest known glacier cave system in the lower 48 states - located on the Northwest face of Mount Hood in Oregon.

Episode produced by Ed Jahn and Amelia Templeton for Oregon Public Broadcasting.
Directors of Photography: Andy Maser and Todd Sonflieth
Additional Video and Support: Hayden Peters
Editor: Todd Sonflieth

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