Tetrahedron (1974)

"That hike went to a 1400 ft. peak in the Rockies. I'm not sure of the specific mountain but it may have been Long's Peak. Yes, we had fun making that. When we got to the top Charlie lay down to rest and I sneaked a bunch of rocks into his pack so that we could film his funny struggle lifting the pack up and on! At the summit I was overcome with hypothermia and blacked out. Fred and Charlie hustled me down the mountain and I slowly recovered. We stopped to make a fire and there are shots in the film of Charlie coaxing up a flame. The lower altitude and the warmth led to recovery. I think I did the edit in Charlies' dome studio at Thorn Lake..." - Gene Bernofsky