Ralph was at the beginning of a two-week vacation at a ski resort in Pennsylvania. He was coasting along with the momentum of a trip down a long slope and passing by the side of a rather steep cliff when another skier, evidently a beginner, sideswiped him slightly.
He stopped, as she did (he didn't know she was female then), and he started to bawl her out for being careless, when a car backfired out on the road. He looked up, realizing suddenly that this was not a good place to stop, and saw the snow above him start to shift.
To the right was a cave, and he grabbed her and ran for it (such as you can run, on skis). He could not easily tell how much snow was piled in front of the cave afterward, but it was over their heads and the volume was at least that of the inside of the cave. The rock was not going to cave in while the snow might well if they tried to dig out, so the thing to do was to wait for rescue. He had seen other skiers in the distance, who would have seen what happened and would send help.
Ralph now turned back to his involuntary companion for the first time, and realized that the long blonde hair he had already glimpsed went with a long body and large breasts. And, at the moment, a worried expression. Not that any of those could be seen clearly in the reflected light coming from above the piled snow..
"Do you think we'll get out of this alive?" she asked.
"I imagine so," he replied. "They know we are here, and they can bring a snowplow up if it's needed. We may not even get hungry in here, though we are likely to get cold."
"I already am," she said. "It is freezing in here."
"Well, to tell the truth, I am too. There is a wind in here, coming in with that daylight we can see up there, but that place is too high up for us to get out by."