Edited sequence on activities of avalanche rescue party in Canadian Rockies; MS of craggy mountain top covered with snow. PAN of range of peaks, TILT DOWN to MLS of cabin on flank of mountain. Shot of snow experts checking instruments. Various shots of avalanche experts testing snow. Shot of skier with knapsack starting downhill run. HALS of valley between towering peaks. Front shot of diesel passenger train going through tunnel. MS of tunnel entrance, name "Connaught Tunnel". Various shots of two skiers skiing downhill away from camera, of two skiers skiing in general direction of camera through snow-laden trees. Shots of avalanche scientists taking readings pertaining to snow conditions. PAN along snow-laden mountain range. LS of small avalanche. Brief shot of full scale snow slide down precipitous cliffs. MS of radio operator at radio through open door of radio sack. Shot of two men carrying skis getting into snowcat snowmobile. LS of small avalanche. CU of snowcat track taken from snowmobile. Front MS of snowmobile. PAN and LS of avalanche scene. HAS of snow and tree-covered mountain, fog in the distance.