I'm trying to find a title to a film I believe took place in Alaska or Canada. I think it involved a brother and sister who were Inuit and I think their friend. The scene I recall the most is they are stuck in a cave and the only way out is to swim through this tunnel that leads out to the ocean. I can't remember if they're running from someone or trying to save something? I also believe they had a grandfather that they would seek advice from. This film definitely came out before 2002. Thanks!