This gave me an idea for a movie.

A young Japanese couple and a third wheel (who was recently dumped, and thus through pity, was invited) are on their way to a small vacation cabin to spend a quiet weekend self reflecting, getting drunk and skiing on the mountains in the Toyama prefecture. As they drive through these corridors of ice, they remark how amazing it is.

They get to the cabin, spend a mostly uneventful weekend except for the fact that the third wheel wasn't dumped, it is revealed that she was the one who did the dumping to get closer to the male lead. Her best friends boyfriend whom she secretly obsesses over. He shrugs it off and mostly ignores it (doesn't tell his GF) and they start their journey home.

The moment they start heading home, the realization that this weekend of closeness to her love is about to end takes its toll. She gets extremely agitated and violent. As they drive back through the corridor, she jumps up from the back seat, grabs the steering wheel and smashes the car into the side of the snow wall. This causes a mountain of snow to pile down onto the car. Everything goes black.

After a few minutes, our characters start to regain consciousness. There is a very subtle ambient deep blue light. Just enough to see. They're not very deep, but deep enough that an escape is impossible without assistance from outside. For 25 minutes or so, they all forget the events that just happened and all cooperate in trying to escape. Or so it seems. The crazy third wheel secretly subverts every attempt they make to escape. There are one or two times where an escape was possible, but the third wheel made sure it was not successful. During the final desperate attempt to escape, the male lead's girlfriend turns into a tentacled abomination and rapes and kills everyone. Not necessarily in that order. Roll credits. Directed by Takeshi Miike.

This cant be safe though....? can it?

Looks like an avalanche waiting to happen built straight up like that, but since the road is open itll be on moving cars